diff --git a/validation-suite/backend/mercury/alembic/versions/202607110001_validation_workflow.py b/validation-suite/backend/mercury/alembic/versions/202607110001_validation_workflow.py
new file mode 100644
index 00000000..4280f8a6
--- /dev/null
+++ b/validation-suite/backend/mercury/alembic/versions/202607110001_validation_workflow.py
@@ -0,0 +1,42 @@
+from __future__ import annotations
+
+from alembic import op
+
+revision = "202607110001"
+down_revision = "202607100002"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.execute("ALTER TABLE validations ALTER COLUMN status TYPE varchar(40) USING status::text")
+    op.execute(
+        """
+        UPDATE validations
+        SET status = CASE status
+            WHEN 'draft' THEN 'ENTWURF'
+            WHEN 'ready_for_report' THEN 'BEREIT_ZUR_PRUEFUNG'
+            WHEN 'in_progress' THEN 'IN_PRUEFUNG'
+            WHEN 'completed' THEN 'ABGESCHLOSSEN'
+            ELSE status
+        END
+        """
+    )
+    op.execute("ALTER TABLE validations ALTER COLUMN status SET DEFAULT 'ENTWURF'")
+
+
+def downgrade() -> None:
+    op.execute(
+        """
+        UPDATE validations
+        SET status = CASE status
+            WHEN 'ENTWURF' THEN 'draft'
+            WHEN 'BEREIT_ZUR_PRUEFUNG' THEN 'ready_for_report'
+            WHEN 'IN_PRUEFUNG' THEN 'in_progress'
+            WHEN 'FREIGEGEBEN' THEN 'ready_for_report'
+            WHEN 'ABGESCHLOSSEN' THEN 'completed'
+            WHEN 'STORNIERT' THEN 'completed'
+            ELSE status
+        END
+        """
+    )
diff --git a/validation-suite/backend/mercury/alembic/versions/202607110002_revalidation_versioning.py b/validation-suite/backend/mercury/alembic/versions/202607110002_revalidation_versioning.py
new file mode 100644
index 00000000..871381fe
--- /dev/null
+++ b/validation-suite/backend/mercury/alembic/versions/202607110002_revalidation_versioning.py
@@ -0,0 +1,25 @@
+from __future__ import annotations
+
+from alembic import op
+import sqlalchemy as sa
+
+revision = "202607110002"
+down_revision = "202607110001"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column("validations", sa.Column("revalidation_interval_months", sa.Integer(), nullable=False, server_default="24"))
+    op.add_column("validations", sa.Column("next_validation_manually_overridden", sa.Boolean(), nullable=False, server_default=sa.false()))
+    op.add_column("validations", sa.Column("version", sa.Integer(), nullable=False, server_default="1"))
+    op.add_column("validations", sa.Column("previous_validation_id", sa.String(), nullable=True))
+    op.create_foreign_key("fk_validations_previous_validation_id_validations", "validations", "validations", ["previous_validation_id"], ["id"])
+
+
+def downgrade() -> None:
+    op.drop_constraint("fk_validations_previous_validation_id_validations", "validations", type_="foreignkey")
+    op.drop_column("validations", "previous_validation_id")
+    op.drop_column("validations", "version")
+    op.drop_column("validations", "next_validation_manually_overridden")
+    op.drop_column("validations", "revalidation_interval_months")
diff --git a/validation-suite/backend/mercury/app/api/v1/domain.py b/validation-suite/backend/mercury/app/api/v1/domain.py
index edc5cf9e..7a9d70c1 100644
--- a/validation-suite/backend/mercury/app/api/v1/domain.py
+++ b/validation-suite/backend/mercury/app/api/v1/domain.py
@@ -2,8 +2,13 @@ from __future__ import annotations
 
 from typing import Any
 
-from fastapi import APIRouter, Depends, Query, Response
+import json
+from pathlib import Path
+
+from fastapi import APIRouter, Depends, Query, Response, UploadFile
+from fastapi.responses import FileResponse, HTMLResponse, JSONResponse
 from sqlalchemy import func, select
+from sqlalchemy.exc import IntegrityError
 from sqlalchemy.orm import Session
 
 from app.api.dependencies import current_user
@@ -14,6 +19,7 @@ from app.models.device import Device
 from app.models.equipment import Equipment
 from app.models.location import Location
 from app.models.validation import Validation
+from app.modules.orion.service import OrionReportService
 from app.schemas.common import PaginatedResponse
 from app.schemas.domain import (
     ContactCreate,
@@ -32,16 +38,22 @@ from app.schemas.domain import (
     LocationRead,
     LocationUpdate,
     ValidationCreate,
+    ValidationImportPreview,
+    ValidationImportRequest,
+    ValidationImportSummary,
     ValidationRead,
+    ValidationReview,
     ValidationUpdate,
 )
 from app.services.domain_service import CrudService, DomainServices
+from app.services.validation_workflow import ValidationWorkflowService
 
 router = APIRouter(tags=["domain"], dependencies=[Depends(current_user)])
 
 
 @router.get("/dashboard")
 def dashboard(session: Session = Depends(get_session)) -> dict[str, int]:
+    today = func.current_date()
     return {
         "customers": session.scalar(select(func.count()).select_from(Customer)) or 0,
         "locations": session.scalar(select(func.count()).select_from(Location)) or 0,
@@ -49,6 +61,11 @@ def dashboard(session: Session = Depends(get_session)) -> dict[str, int]:
         "devices": session.scalar(select(func.count()).select_from(Device)) or 0,
         "equipment": session.scalar(select(func.count()).select_from(Equipment)) or 0,
         "validations": session.scalar(select(func.count()).select_from(Validation)) or 0,
+        "validation_drafts": session.scalar(select(func.count()).select_from(Validation).where(Validation.status == "ENTWURF")) or 0,
+        "validation_ready": session.scalar(select(func.count()).select_from(Validation).where(Validation.status == "BEREIT_ZUR_PRUEFUNG")) or 0,
+        "validation_in_review": session.scalar(select(func.count()).select_from(Validation).where(Validation.status == "IN_PRUEFUNG")) or 0,
+        "validation_approved": session.scalar(select(func.count()).select_from(Validation).where(Validation.status == "FREIGEGEBEN")) or 0,
+        "validation_overdue": session.scalar(select(func.count()).select_from(Validation).where(Validation.next_validation_on < today)) or 0,
     }
 
 
@@ -61,17 +78,33 @@ def paging(
 
 
 def commit_create(session: Session, service: CrudService, payload):
-    item = service.create(payload.model_dump())
-    session.commit()
-    session.refresh(item)
-    return item
+    try:
+        item = service.create(payload.model_dump())
+        if isinstance(item, Validation):
+            ValidationWorkflowService(session).apply_revalidation_date(item)
+        session.commit()
+        session.refresh(item)
+        return item
+    except IntegrityError as exc:
+        session.rollback()
+        from fastapi import HTTPException
+
+        raise HTTPException(status_code=409, detail="Datensatz verletzt Datenbankbeziehungen.") from exc
 
 
 def commit_update(session: Session, service: CrudService, item_id: str, payload):
-    item = service.update(item_id, payload.model_dump())
-    session.commit()
-    session.refresh(item)
-    return item
+    try:
+        item = service.update(item_id, payload.model_dump())
+        if isinstance(item, Validation):
+            ValidationWorkflowService(session).apply_revalidation_date(item)
+        session.commit()
+        session.refresh(item)
+        return item
+    except IntegrityError as exc:
+        session.rollback()
+        from fastapi import HTTPException
+
+        raise HTTPException(status_code=409, detail="Datensatz verletzt Datenbankbeziehungen.") from exc
 
 
 def commit_delete(session: Session, service: CrudService, item_id: str) -> Response:
@@ -181,8 +214,39 @@ def delete_equipment(item_id: str, session: Session = Depends(get_session)):
 
 
 @router.get("/validations", response_model=PaginatedResponse[ValidationRead])
-def list_validations(params: dict = Depends(paging), session: Session = Depends(get_session)):
-    return DomainServices(session).validations.list(**params)
+def list_validations(
+    search: str | None = Query(default=None, max_length=120),
+    page: int = Query(default=1, ge=1),
+    page_size: int = Query(default=20, ge=1, le=100),
+    sort_by: str = Query(default="updated_at"),
+    sort_order: str = Query(default="desc", pattern="^(asc|desc)$"),
+    status: str | None = None,
+    customer_id: str | None = None,
+    device_id: str | None = None,
+    validation_type: str | None = None,
+    result: str | None = None,
+    date_from: str | None = None,
+    date_to: str | None = None,
+    overdue_only: bool = False,
+    session: Session = Depends(get_session),
+):
+    return ValidationWorkflowService(session).query_validations(
+        search=search,
+        page=page,
+        page_size=page_size,
+        sort_by=sort_by,
+        sort_order=sort_order,
+        filters={
+            "status": status,
+            "customer_id": customer_id,
+            "device_id": device_id,
+            "validation_type": validation_type,
+            "result": result,
+            "date_from": date_from,
+            "date_to": date_to,
+            "overdue_only": overdue_only,
+        },
+    )
 
 
 @router.get("/validations/next-report-number")
@@ -213,4 +277,101 @@ def update_validation(item_id: str, payload: ValidationUpdate, session: Session
 
 @router.delete("/validations/{item_id}", status_code=204)
 def delete_validation(item_id: str, session: Session = Depends(get_session)):
+    item = DomainServices(session).validations.repository.get(item_id)
+    if item and item.status != "ENTWURF":
+        from fastapi import HTTPException
+
+        raise HTTPException(status_code=409, detail="Only draft validations can be deleted")
     return commit_delete(session, DomainServices(session).validations, item_id)
+
+
+@router.post("/validations/{item_id}/review", response_model=ValidationReview)
+def review_validation(item_id: str, session: Session = Depends(get_session)):
+    item = DomainServices(session).validations.repository.get(item_id)
+    if item is None:
+        from fastapi import HTTPException
+
+        raise HTTPException(status_code=404, detail="Resource not found")
+    review = ValidationWorkflowService(session).mark_ready_for_review(item)
+    session.commit()
+    return review
+
+
+@router.post("/validations/{item_id}/duplicate", response_model=ValidationRead, status_code=201)
+def duplicate_validation(item_id: str, session: Session = Depends(get_session)):
+    item = DomainServices(session).validations.repository.get(item_id)
+    if item is None:
+        from fastapi import HTTPException
+
+        raise HTTPException(status_code=404, detail="Resource not found")
+    clone = ValidationWorkflowService(session).duplicate(item)
+    session.commit()
+    session.refresh(clone)
+    return clone
+
+
+@router.post("/validations/{item_id}/new-version", response_model=ValidationRead, status_code=201)
+def new_validation_version(item_id: str, session: Session = Depends(get_session)):
+    item = DomainServices(session).validations.repository.get(item_id)
+    if item is None:
+        from fastapi import HTTPException
+
+        raise HTTPException(status_code=404, detail="Resource not found")
+    clone = ValidationWorkflowService(session).create_new_version(item)
+    session.commit()
+    session.refresh(clone)
+    return clone
+
+
+@router.post("/validations/{item_id}/cancel", response_model=ValidationRead)
+def cancel_validation(item_id: str, session: Session = Depends(get_session)):
+    item = DomainServices(session).validations.repository.get(item_id)
+    if item is None:
+        from fastapi import HTTPException
+
+        raise HTTPException(status_code=404, detail="Resource not found")
+    item.status = "STORNIERT"
+    session.commit()
+    session.refresh(item)
+    return item
+
+
+@router.get("/validations/{item_id}/export.json")
+def export_validation_json(item_id: str, session: Session = Depends(get_session)):
+    item = DomainServices(session).validations.repository.get(item_id)
+    if item is None:
+        from fastapi import HTTPException
+
+        raise HTTPException(status_code=404, detail="Resource not found")
+    data = ValidationWorkflowService(session).export_json(item)
+    return JSONResponse(
+        content=json.loads(json.dumps(data, default=str)),
+        headers={"Content-Disposition": f'attachment; filename="{item.report_number}.json"'},
+    )
+
+
+@router.post("/validations/import/csv-preview", response_model=ValidationImportPreview)
+async def preview_validation_csv(file: UploadFile, session: Session = Depends(get_session)):
+    return ValidationWorkflowService(session).preview_csv(await file.read())
+
+
+@router.post("/validations/import/json", response_model=ValidationImportSummary)
+def import_validation_json(payload: ValidationImportRequest, session: Session = Depends(get_session)):
+    summary = ValidationWorkflowService(session).import_rows(payload.rows, payload.duplicate_strategy)
+    session.commit()
+    return summary
+
+
+@router.get("/validations/{item_id}/report.html", response_class=HTMLResponse)
+def validation_report_preview(item_id: str, session: Session = Depends(get_session)):
+    return OrionReportService(session, Path("/app/reports")).render_html(item_id)
+
+
+@router.get("/validations/{item_id}/report.pdf")
+def validation_report_pdf(item_id: str, session: Session = Depends(get_session)):
+    report_path = OrionReportService(session, Path("/app/reports")).render_pdf(item_id)
+    return FileResponse(
+        report_path,
+        media_type="application/pdf",
+        filename=report_path.name,
+    )
diff --git a/validation-suite/backend/mercury/app/models/validation.py b/validation-suite/backend/mercury/app/models/validation.py
index fa204038..ed7205fb 100644
--- a/validation-suite/backend/mercury/app/models/validation.py
+++ b/validation-suite/backend/mercury/app/models/validation.py
@@ -3,17 +3,19 @@ from __future__ import annotations
 import enum
 from datetime import date
 
-from sqlalchemy import Date, Enum, ForeignKey, JSON, String, Text
+from sqlalchemy import Boolean, Date, ForeignKey, Integer, JSON, String, Text
 from sqlalchemy.orm import Mapped, mapped_column
 
 from app.db.base import Base, TimestampMixin, UUIDMixin
 
 
 class ValidationStatus(str, enum.Enum):
-    draft = "draft"
-    in_progress = "in_progress"
-    ready_for_report = "ready_for_report"
-    completed = "completed"
+    draft = "ENTWURF"
+    ready_for_review = "BEREIT_ZUR_PRUEFUNG"
+    in_review = "IN_PRUEFUNG"
+    approved = "FREIGEGEBEN"
+    completed = "ABGESCHLOSSEN"
+    cancelled = "STORNIERT"
 
 
 class Validation(Base, UUIDMixin, TimestampMixin):
@@ -22,7 +24,7 @@ class Validation(Base, UUIDMixin, TimestampMixin):
     report_number: Mapped[str] = mapped_column(String(80), unique=True, index=True)
     customer_id: Mapped[str] = mapped_column(ForeignKey("customers.id"), index=True)
     location_id: Mapped[str | None] = mapped_column(ForeignKey("locations.id"), index=True)
-    contact_id: Mapped[str | None] = mapped_column(ForeignKey("contacts.id"), index=True)
+    contact_id: Mapped[str | None] = mapped_column(ForeignKey("contacts.id"), index=True, nullable=True)
     device_id: Mapped[str | None] = mapped_column(ForeignKey("devices.id"), index=True)
     validation_type: Mapped[str] = mapped_column(String(120))
     project: Mapped[str | None] = mapped_column(String(180))
@@ -33,8 +35,12 @@ class Validation(Base, UUIDMixin, TimestampMixin):
     scheduled_on: Mapped[date | None] = mapped_column(Date)
     performed_on: Mapped[date | None] = mapped_column(Date)
     next_validation_on: Mapped[date | None] = mapped_column(Date)
-    examiner_id: Mapped[str | None] = mapped_column(ForeignKey("users.id"))
-    status: Mapped[ValidationStatus] = mapped_column(Enum(ValidationStatus), default=ValidationStatus.draft)
+    revalidation_interval_months: Mapped[int] = mapped_column(Integer, default=24)
+    next_validation_manually_overridden: Mapped[bool] = mapped_column(Boolean, default=False)
+    version: Mapped[int] = mapped_column(Integer, default=1)
+    previous_validation_id: Mapped[str | None] = mapped_column(ForeignKey("validations.id"), nullable=True)
+    examiner_id: Mapped[str | None] = mapped_column(ForeignKey("users.id"), nullable=True)
+    status: Mapped[str] = mapped_column(String(40), default=ValidationStatus.draft.value)
     result: Mapped[str | None] = mapped_column(String(120))
     notes: Mapped[str | None] = mapped_column(Text)
     equipment_ids: Mapped[list[str]] = mapped_column(JSON, default=list)
diff --git a/validation-suite/backend/mercury/app/modules/orion/components/__init__.py b/validation-suite/backend/mercury/app/modules/orion/components/__init__.py
new file mode 100644
index 00000000..60157fc2
--- /dev/null
+++ b/validation-suite/backend/mercury/app/modules/orion/components/__init__.py
@@ -0,0 +1,37 @@
+from app.modules.orion.components.base import ReportComponent
+from app.modules.orion.components.chapters import (
+    AttachmentComponent,
+    ChecklistComponent,
+    CoverComponent,
+    CustomerComponent,
+    DeviceComponent,
+    DryingComponent,
+    EnvironmentComponent,
+    EquipmentComponent,
+    LoadingComponent,
+    MeasurementComponent,
+    ProgramComponent,
+    RecommendationComponent,
+    StaticTextComponent,
+    SummaryComponent,
+    TocComponent,
+)
+
+__all__ = [
+    "AttachmentComponent",
+    "ChecklistComponent",
+    "CoverComponent",
+    "CustomerComponent",
+    "DeviceComponent",
+    "DryingComponent",
+    "EnvironmentComponent",
+    "EquipmentComponent",
+    "LoadingComponent",
+    "MeasurementComponent",
+    "ProgramComponent",
+    "RecommendationComponent",
+    "StaticTextComponent",
+    "ReportComponent",
+    "SummaryComponent",
+    "TocComponent",
+]
diff --git a/validation-suite/backend/mercury/app/modules/orion/components/base.py b/validation-suite/backend/mercury/app/modules/orion/components/base.py
new file mode 100644
index 00000000..cc752f75
--- /dev/null
+++ b/validation-suite/backend/mercury/app/modules/orion/components/base.py
@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+from abc import ABC, abstractmethod
+
+from app.modules.orion.context import ReportContext
+
+
+class ReportComponent(ABC):
+    anchor: str
+    title: str
+
+    @abstractmethod
+    def render(self, context: ReportContext) -> str:
+        raise NotImplementedError
+
diff --git a/validation-suite/backend/mercury/app/modules/orion/components/chapters.py b/validation-suite/backend/mercury/app/modules/orion/components/chapters.py
new file mode 100644
index 00000000..41724f63
--- /dev/null
+++ b/validation-suite/backend/mercury/app/modules/orion/components/chapters.py
@@ -0,0 +1,325 @@
+from __future__ import annotations
+
+from app.modules.orion.components.base import ReportComponent
+from app.modules.orion.context import ReportContext
+from app.modules.orion.html import definition_list, paragraph, section, table, text, yes_no
+
+
+class CoverComponent(ReportComponent):
+    anchor = "cover"
+    title = "Deckblatt"
+
+    def render(self, context: ReportContext) -> str:
+        validation = context.validation
+        rows = definition_list(
+            [
+                ("Berichtsnummer", validation.report_number),
+                ("Validierungsart", validation.validation_type),
+                ("Projekt", validation.project),
+                ("Pruefdatum", validation.performed_on),
+                ("Pruefungsort", validation.test_location),
+                ("Pruefer", validation.examiner_name),
+                ("Gesamtergebnis", validation.result),
+                ("Status", validation.status),
+                ("Ansprechpartner", context.contact.full_name if context.contact else "nicht erfasst"),
+                ("Mitwirkende Personen", validation.participants or "nicht erfasst"),
+            ]
+        )
+        return (
+            "<section class=\"cover-page\" id=\"cover\">"
+            "<div class=\"cover-kicker\">Neutraler Logo-Platzhalter · Validation Suite</div>"
+            "<h1>Pruefbericht zur Validierung</h1>"
+            "<p class=\"cover-subtitle\">Funktions- und Leistungsqualifikation Klein-Sterilisator</p>"
+            f"<p class=\"cover-subtitle\">{text(context.customer.name)}</p>"
+            f"{rows}"
+            "<div class=\"signature-grid\"><div>Unterschrift technische Validierung</div><div>Unterschrift Auftraggeber</div></div>"
+            "</section>"
+        )
+
+
+class TocComponent(ReportComponent):
+    anchor = "toc"
+    title = "Inhaltsverzeichnis"
+
+    def __init__(self, components: list[ReportComponent]) -> None:
+        self.components = components
+
+    def render(self, context: ReportContext) -> str:
+        links = "".join(
+            f"<li><a href=\"#{component.anchor}\">{text(component.title)}</a></li>"
+            for component in self.components
+            if component.anchor not in {"cover", "toc"}
+        )
+        return section(self.anchor, self.title, f"<ol class=\"toc-list\">{links}</ol>")
+
+
+class SummaryComponent(ReportComponent):
+    anchor = "summary"
+    title = "Zusammenfassendes Ergebnis der Validierung"
+
+    def render(self, context: ReportContext) -> str:
+        validation = context.validation
+        body = definition_list(
+            [
+                ("Kunde", context.customer.name),
+                ("Standort", context.location.name if context.location else None),
+                ("Geraet", f"{context.device.manufacturer} {context.device.model}" if context.device else None),
+                ("Pruefmittel", len(context.equipment)),
+                ("Ergebnis", validation.result),
+                ("Mitwirkende Personen", validation.participants),
+                ("Hinweis auf naechste Leistungsbeurteilung", validation.next_validation_on or "nicht erfasst"),
+            ]
+        )
+        return section(self.anchor, self.title, body)
+
+
+class StaticTextComponent(ReportComponent):
+    def __init__(self, anchor: str, title: str, body: str = "nicht erfasst") -> None:
+        self.anchor = anchor
+        self.title = title
+        self.body = body
+
+    def render(self, context: ReportContext) -> str:
+        return section(self.anchor, self.title, f"<p>{text(self.body)}</p>")
+
+
+class CustomerComponent(ReportComponent):
+    anchor = "customer"
+    title = "Kunde, Standort und Ansprechpartner"
+
+    def render(self, context: ReportContext) -> str:
+        customer = context.customer
+        location = context.location
+        contact = context.contact
+        body = "<h3>Kunde</h3>" + definition_list(
+            [
+                ("Name", customer.name),
+                ("Typ", customer.customer_type.value),
+                ("Adresse", " ".join(filter(None, [customer.street, customer.postal_code, customer.city]))),
+                ("Telefon", customer.phone),
+                ("Mail", customer.email),
+                ("Betreiber", context.validation.operator_name),
+                ("QM", customer.quality_manager),
+                ("Hygienebeauftragter", customer.hygiene_officer),
+            ]
+        )
+        if location:
+            body += "<h3>Standort</h3>" + definition_list(
+                [
+                    ("Name", location.name),
+                    ("Adresse", " ".join(filter(None, [location.street, location.postal_code, location.city]))),
+                    ("Raum", location.room),
+                ]
+            )
+        if contact:
+            body += "<h3>Ansprechpartner</h3>" + definition_list(
+                [
+                    ("Name", contact.full_name),
+                    ("Funktion", contact.function),
+                    ("Mail", contact.email),
+                    ("Telefon", contact.phone),
+                ]
+            )
+        return section(self.anchor, self.title, body)
+
+
+class DeviceComponent(ReportComponent):
+    anchor = "device"
+    title = "Geraet"
+
+    def render(self, context: ReportContext) -> str:
+        device = context.device
+        if device is None:
+            return section(self.anchor, self.title, "")
+        body = definition_list(
+            [
+                ("Hersteller", device.manufacturer),
+                ("Modell", device.model),
+                ("Typ", device.device_type),
+                ("Seriennummer", device.serial_number),
+                ("Baujahr", device.year_built),
+                ("Inbetriebnahme", device.commissioned_on),
+                ("Kammervolumen", f"{device.chamber_volume_liters} Liter" if device.chamber_volume_liters else None),
+                ("Dampferzeugung", device.steam_generation),
+                ("Wasseraufbereitung", device.water_treatment),
+                ("Dokumentation", device.documentation),
+                ("Lieferant", device.supplier),
+            ]
+        )
+        return section(self.anchor, self.title, body)
+
+
+class EquipmentComponent(ReportComponent):
+    anchor = "equipment"
+    title = "Pruefmittel"
+
+    def render(self, context: ReportContext) -> str:
+        rows = [
+            [
+                item.kind.value,
+                item.manufacturer,
+                item.model,
+                item.serial_number,
+                item.calibrated_on,
+                item.calibration_due_on,
+                item.status.value,
+            ]
+            for item in context.equipment
+        ]
+        return section(
+            self.anchor,
+            self.title,
+            table(
+                ["Art", "Hersteller", "Modell", "Seriennummer", "Kalibriert", "Gueltig bis", "Status"],
+                rows,
+            ),
+        )
+
+
+class EnvironmentComponent(ReportComponent):
+    anchor = "environment"
+    title = "Umgebungsbedingungen"
+
+    def render(self, context: ReportContext) -> str:
+        data = context.validation.environment_conditions or {}
+        body = definition_list(
+            [
+                ("Raumtemperatur", data.get("room_temperature")),
+                ("relative Luftfeuchtigkeit", data.get("humidity")),
+                ("Pruefzeit", data.get("test_time")),
+            ]
+        )
+        rows = [[item.get("text"), yes_no(item.get("value")), item.get("comment")] for item in data.get("checks", [])]
+        if rows:
+            body += table(["Pruefpunkt", "Bewertung", "Kommentar"], rows)
+        return section(self.anchor, self.title, body)
+
+
+class ChecklistComponent(ReportComponent):
+    anchor = "checklists"
+    title = "Dokumentations- und Leistungschecklisten"
+
+    def render(self, context: ReportContext) -> str:
+        documentation = context.validation.documentation_checklist or []
+        performance = context.validation.performance_checklist or []
+        body = "<h3>Dokumentation</h3>" + self._render_items(documentation)
+        body += "<h3>Leistung</h3>" + self._render_items(performance)
+        return section(self.anchor, self.title, body)
+
+    def _render_items(self, items: list[dict]) -> str:
+        rows = [
+            [item.get("number"), item.get("text"), yes_no(item.get("value")), item.get("comment")]
+            for item in items
+        ]
+        return table(["Nr.", "Pruefpunkt", "Bewertung", "Kommentar"], rows)
+
+
+class ProgramComponent(ReportComponent):
+    anchor = "programs"
+    title = "Programme"
+
+    def render(self, context: ReportContext) -> str:
+        programs = [item for item in (context.validation.programs or []) if item.get("selected")]
+        rows = [[index + 1, item.get("name"), "Eigenes Programm" if item.get("custom") else "Standard"] for index, item in enumerate(programs)]
+        return section(self.anchor, self.title, table(["Nr.", "Programm", "Typ"], rows))
+
+
+class LoadingComponent(ReportComponent):
+    anchor = "loading"
+    title = "Beladungsmuster"
+
+    def render(self, context: ReportContext) -> str:
+        rows = [
+            [item.get("run"), item.get("pattern"), item.get("description"), len(item.get("images", []))]
+            for item in context.validation.loading_patterns or []
+        ]
+        return section(self.anchor, self.title, table(["Testlauf", "Beladungsmuster", "Beschreibung", "Bilder"], rows))
+
+
+class MeasurementComponent(ReportComponent):
+    anchor = "measurements"
+    title = "Messdaten"
+
+    def render(self, context: ReportContext) -> str:
+        rows = [
+            [
+                item.get("name"),
+                item.get("start_time"),
+                item.get("end_time"),
+                item.get("duration"),
+                item.get("leak_rate"),
+                item.get("min_temperature"),
+                item.get("max_temperature"),
+                item.get("temperature_band"),
+                item.get("holding_time"),
+                item.get("pressure"),
+                item.get("result"),
+            ]
+            for item in context.validation.measurement_data or []
+        ]
+        body = table(
+            [
+                "Bereich",
+                "Start",
+                "Ende",
+                "Dauer",
+                "Leckrate",
+                "Min. Temp.",
+                "Max. Temp.",
+                "Band",
+                "Haltezeit",
+                "Druck",
+                "Ergebnis",
+            ],
+            rows,
+            "compact",
+        )
+        winlog_rows = []
+        for item in context.validation.measurement_data or []:
+            for imported in item.get("imports", []):
+                winlog_rows.append([item.get("name"), imported.get("filename"), imported.get("content_type")])
+        if winlog_rows:
+            body += "<h3>Winlog-Dateien</h3>" + table(["Bereich", "Datei", "Typ"], winlog_rows)
+        return section(self.anchor, self.title, body)
+
+
+class DryingComponent(ReportComponent):
+    anchor = "drying"
+    title = "Trocknung"
+
+    def render(self, context: ReportContext) -> str:
+        data = context.validation.drying or {}
+        body = definition_list(
+            [
+                ("Startgewicht", data.get("start_weight")),
+                ("Endgewicht", data.get("end_weight")),
+                ("Differenz", data.get("difference")),
+                ("Bewertung", data.get("rating")),
+                ("Bemerkung", data.get("comment")),
+            ]
+        )
+        return section(self.anchor, self.title, body)
+
+
+class RecommendationComponent(ReportComponent):
+    anchor = "recommendations"
+    title = "Empfehlungen und Auflagen"
+
+    def render(self, context: ReportContext) -> str:
+        rows = [
+            [item.get("number"), item.get("text"), item.get("deadline"), item.get("status")]
+            for item in context.validation.recommendations or []
+        ]
+        return section(self.anchor, self.title, table(["Nr.", "Text", "Frist", "Status"], rows))
+
+
+class AttachmentComponent(ReportComponent):
+    anchor = "attachments"
+    title = "Bilder und Anlagen"
+
+    def render(self, context: ReportContext) -> str:
+        rows = [
+            [item.get("order"), item.get("category"), item.get("filename"), item.get("description")]
+            for item in sorted(context.validation.attachments or [], key=lambda row: row.get("order") or 0)
+        ]
+        return section(self.anchor, self.title, table(["Reihenfolge", "Kategorie", "Datei", "Beschreibung"], rows))
diff --git a/validation-suite/backend/mercury/app/modules/orion/context.py b/validation-suite/backend/mercury/app/modules/orion/context.py
new file mode 100644
index 00000000..0c78a49c
--- /dev/null
+++ b/validation-suite/backend/mercury/app/modules/orion/context.py
@@ -0,0 +1,64 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from pathlib import Path
+
+from fastapi import HTTPException, status
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from app.models.contact import Contact
+from app.models.customer import Customer
+from app.models.device import Device
+from app.models.equipment import Equipment
+from app.models.location import Location
+from app.models.validation import Validation
+
+
+@dataclass(frozen=True)
+class ReportContext:
+    validation: Validation
+    customer: Customer
+    location: Location | None
+    contact: Contact | None
+    device: Device | None
+    equipment: list[Equipment]
+    generated_dir: Path
+
+
+class OrionContextBuilder:
+    def __init__(self, session: Session, generated_dir: Path) -> None:
+        self.session = session
+        self.generated_dir = generated_dir
+
+    def build(self, validation_id: str) -> ReportContext:
+        validation = self.session.get(Validation, validation_id)
+        if validation is None:
+            raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Validation not found")
+
+        customer = self.session.get(Customer, validation.customer_id)
+        if customer is None:
+            raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Validation has no customer")
+
+        location = self.session.get(Location, validation.location_id) if validation.location_id else None
+        contact = self.session.get(Contact, validation.contact_id) if validation.contact_id else None
+        device = self.session.get(Device, validation.device_id) if validation.device_id else None
+        equipment = []
+        if validation.equipment_ids:
+            equipment = list(
+                self.session.scalars(
+                    select(Equipment).where(Equipment.id.in_(validation.equipment_ids))
+                )
+            )
+
+        self.generated_dir.mkdir(parents=True, exist_ok=True)
+        return ReportContext(
+            validation=validation,
+            customer=customer,
+            location=location,
+            contact=contact,
+            device=device,
+            equipment=equipment,
+            generated_dir=self.generated_dir,
+        )
+
diff --git a/validation-suite/backend/mercury/app/modules/orion/html.py b/validation-suite/backend/mercury/app/modules/orion/html.py
new file mode 100644
index 00000000..052d59c4
--- /dev/null
+++ b/validation-suite/backend/mercury/app/modules/orion/html.py
@@ -0,0 +1,45 @@
+from __future__ import annotations
+
+from datetime import date, datetime
+from html import escape
+from typing import Any
+
+
+def text(value: Any) -> str:
+    if value is None or value == "":
+        return "nicht erfasst"
+    if isinstance(value, (date, datetime)):
+        return value.strftime("%d.%m.%Y")
+    return escape(str(value))
+
+
+def paragraph(value: Any) -> str:
+    content = text(value)
+    return content.replace("\n", "<br>")
+
+
+def yes_no(value: Any) -> str:
+    labels = {"yes": "Ja", "no": "Nein", "na": "Nicht zutreffend", True: "Ja", False: "Nein"}
+    return text(labels.get(value, value))
+
+
+def definition_list(rows: list[tuple[str, Any]]) -> str:
+    items = "".join(
+        f"<div class=\"definition-row\"><dt>{text(label)}</dt><dd>{paragraph(value)}</dd></div>"
+        for label, value in rows
+        if value not in (None, "", [])
+    )
+    return f"<dl class=\"definition-list\">{items}</dl>"
+
+
+def table(headers: list[str], rows: list[list[Any]], css_class: str = "") -> str:
+    head = "".join(f"<th>{text(header)}</th>" for header in headers)
+    body = "".join(
+        "<tr>" + "".join(f"<td>{paragraph(cell)}</td>" for cell in row) + "</tr>"
+        for row in rows
+    )
+    return f"<table class=\"data-table {css_class}\"><thead><tr>{head}</tr></thead><tbody>{body}</tbody></table>"
+
+
+def section(chapter_id: str, title: str, body: str) -> str:
+    return f"<section class=\"chapter\" id=\"{text(chapter_id)}\"><h2>{text(title)}</h2>{body}</section>"
diff --git a/validation-suite/backend/mercury/app/modules/orion/service.py b/validation-suite/backend/mercury/app/modules/orion/service.py
index 17261ef2..05fcdc75 100644
--- a/validation-suite/backend/mercury/app/modules/orion/service.py
+++ b/validation-suite/backend/mercury/app/modules/orion/service.py
@@ -2,29 +2,75 @@ from __future__ import annotations
 
 from pathlib import Path
 
-from weasyprint import HTML
+from sqlalchemy.orm import Session
+
+from app.modules.orion.components import (
+    AttachmentComponent,
+    ChecklistComponent,
+    CoverComponent,
+    CustomerComponent,
+    DeviceComponent,
+    DryingComponent,
+    EnvironmentComponent,
+    EquipmentComponent,
+    LoadingComponent,
+    MeasurementComponent,
+    ProgramComponent,
+    RecommendationComponent,
+    ReportComponent,
+    StaticTextComponent,
+    SummaryComponent,
+    TocComponent,
+)
+from app.modules.orion.context import OrionContextBuilder, ReportContext
+from app.modules.orion.templates.report import render_document
 
 
 class OrionReportService:
-    chapters = [
-        "Deckblatt",
-        "Inhaltsverzeichnis",
-        "Zusammenfassung",
-        "Gerät",
-        "Kunde",
-        "Normen",
-        "Prüfmittel",
-        "Programme",
-        "Beladung",
-        "Messungen",
-        "Diagramme",
-        "Empfehlungen",
-        "Anlagen",
-    ]
+    def __init__(self, session: Session, generated_dir: Path | None = None) -> None:
+        self.session = session
+        self.generated_dir = generated_dir or Path("/app/reports")
 
-    def render_pdf(self, title: str, output_path: Path) -> Path:
-        chapter_markup = "".join(f"<section><h2>{chapter}</h2></section>" for chapter in self.chapters)
-        html = f"<html><body><h1>{title}</h1>{chapter_markup}</body></html>"
-        HTML(string=html).write_pdf(output_path)
+    def render_html(self, validation_id: str) -> str:
+        context = OrionContextBuilder(self.session, self.generated_dir).build(validation_id)
+        components = self._components()
+        chapters = [component.render(context) for component in components]
+        return render_document(context, chapters)
+
+    def render_pdf(self, validation_id: str) -> Path:
+        from weasyprint import HTML
+
+        context = OrionContextBuilder(self.session, self.generated_dir).build(validation_id)
+        output_path = context.generated_dir / f"{context.validation.report_number}.pdf"
+        html = self.render_html(validation_id)
+        HTML(string=html, base_url=str(context.generated_dir)).write_pdf(output_path)
         return output_path
 
+    def _components(self) -> list[ReportComponent]:
+        chapters: list[ReportComponent] = [
+            StaticTextComponent("bq", "1. Funktionsqualifikation (BQ)", "Anlass, Ziel und gesetzliche Grundlagen werden anhand der erfassten Validierungsdaten bewertet."),
+            StaticTextComponent("bq-goal", "1.1 Anlass und Ziel der Pruefung"),
+            StaticTextComponent("legal", "1.2 Gesetzliche Grundlagen"),
+            DeviceComponent(),
+            StaticTextComponent("performance", "1.4 Leistungsueberpruefung"),
+            ChecklistComponent(),
+            StaticTextComponent("work-instructions", "Arbeitsanweisungen"),
+            EnvironmentComponent(),
+            StaticTextComponent("batch-control", "1.9 Chargenkontrolle"),
+            ProgramComponent(),
+            LoadingComponent(),
+            StaticTextComponent("reference-load", "1.12 Referenzbeladung"),
+            EquipmentComponent(),
+            StaticTextComponent("equipment-thermo", "2.2 Pruefmittel zur thermoelektrischen Untersuchung"),
+            StaticTextComponent("configuration", "3. Pruefkonfiguration"),
+            MeasurementComponent(),
+            StaticTextComponent("results", "4. Ergebnisse der Validierung"),
+            DryingComponent(),
+            RecommendationComponent(),
+            AttachmentComponent(),
+            StaticTextComponent("cycles", "6. Programmablaeufe / Zyklen"),
+            StaticTextComponent("risk", "7. Risikoeinstufung und Abschlussgespraech"),
+            StaticTextComponent("certificates", "8. Zertifikate"),
+            StaticTextComponent("calibration-certificates", "9. Kalibrierzertifikate"),
+        ]
+        return [CoverComponent(), SummaryComponent(), TocComponent(chapters), CustomerComponent(), *chapters]
diff --git a/validation-suite/backend/mercury/app/modules/orion/templates/report.css b/validation-suite/backend/mercury/app/modules/orion/templates/report.css
new file mode 100644
index 00000000..b74117f8
--- /dev/null
+++ b/validation-suite/backend/mercury/app/modules/orion/templates/report.css
@@ -0,0 +1,201 @@
+@page {
+  size: A4;
+  margin: 24mm 16mm 22mm 16mm;
+  @top-left {
+    content: "Validation Suite";
+    color: #4F6A74;
+    font-size: 9pt;
+    font-weight: 700;
+  }
+  @top-right {
+    content: string(report-number);
+    color: #6B7C85;
+    font-size: 9pt;
+  }
+  @bottom-left {
+    content: "Schubamed";
+    color: #6B7C85;
+    font-size: 8pt;
+  }
+  @bottom-right {
+    content: "Seite " counter(page) " von " counter(pages);
+    color: #6B7C85;
+    font-size: 8pt;
+  }
+}
+
+@page:first {
+  margin: 20mm 16mm 18mm 16mm;
+  @top-left { content: ""; }
+  @top-right { content: ""; }
+}
+
+* {
+  box-sizing: border-box;
+}
+
+html {
+  color: #2E3B40;
+  font-family: Inter, Arial, sans-serif;
+  font-size: 10.5pt;
+  line-height: 1.45;
+}
+
+body {
+  margin: 0;
+}
+
+.report-meta {
+  string-set: report-number attr(data-report-number);
+}
+
+.cover-page {
+  min-height: 245mm;
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  page-break-after: always;
+}
+
+.cover-kicker {
+  color: #6C8A96;
+  font-size: 11pt;
+  font-weight: 700;
+  letter-spacing: .08em;
+  margin-bottom: 14mm;
+  text-transform: uppercase;
+}
+
+h1 {
+  color: #2E3B40;
+  font-size: 34pt;
+  line-height: 1.05;
+  margin: 0 0 8mm 0;
+}
+
+.cover-subtitle {
+  color: #4F6A74;
+  font-size: 16pt;
+  margin: 0 0 18mm 0;
+}
+
+.signature-grid {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 16mm;
+  margin-top: 18mm;
+}
+
+.signature-grid div {
+  border-top: 1px solid #6B7C85;
+  color: #6B7C85;
+  padding-top: 3mm;
+}
+
+.chapter {
+  break-before: page;
+}
+
+h2 {
+  border-bottom: 1px solid #E6EAEA;
+  color: #2E3B40;
+  font-size: 18pt;
+  margin: 0 0 8mm 0;
+  padding-bottom: 4mm;
+}
+
+h3 {
+  color: #4F6A74;
+  font-size: 12pt;
+  margin: 8mm 0 3mm 0;
+}
+
+.definition-list {
+  display: block;
+  margin: 0;
+}
+
+.definition-row {
+  border-bottom: 1px solid #E6EAEA;
+  display: grid;
+  grid-template-columns: 42mm 1fr;
+  gap: 6mm;
+  padding: 2.5mm 0;
+}
+
+dt {
+  color: #6B7C85;
+  font-weight: 700;
+}
+
+dd {
+  margin: 0;
+}
+
+.data-table {
+  border-collapse: collapse;
+  margin-top: 4mm;
+  table-layout: fixed;
+  width: 100%;
+}
+
+.data-table th {
+  background: #F7F8F8;
+  color: #4F6A74;
+  font-size: 8.5pt;
+  font-weight: 700;
+  text-align: left;
+}
+
+.data-table th,
+.data-table td {
+  border: 1px solid #E6EAEA;
+  padding: 2.4mm;
+  vertical-align: top;
+  word-wrap: break-word;
+}
+
+.data-table.compact {
+  font-size: 8.5pt;
+}
+
+.toc-list {
+  counter-reset: toc;
+  list-style: none;
+  margin: 0;
+  padding: 0;
+}
+
+.toc-list li {
+  border-bottom: 1px solid #E6EAEA;
+  padding: 3mm 0;
+}
+
+.toc-list a {
+  color: #2E3B40;
+  text-decoration: none;
+}
+
+@media screen {
+  body {
+    background: #F7F8F8;
+    padding: 24px;
+  }
+
+  .report-document {
+    background: #FFFFFF;
+    box-shadow: 0 14px 40px rgba(46, 59, 64, 0.08);
+    margin: 0 auto;
+    max-width: 960px;
+    padding: 48px;
+  }
+
+  .cover-page {
+    min-height: auto;
+  }
+
+  .chapter {
+    break-before: auto;
+    margin-top: 48px;
+  }
+}
diff --git a/validation-suite/backend/mercury/app/modules/orion/templates/report.py b/validation-suite/backend/mercury/app/modules/orion/templates/report.py
new file mode 100644
index 00000000..f28c9aca
--- /dev/null
+++ b/validation-suite/backend/mercury/app/modules/orion/templates/report.py
@@ -0,0 +1,28 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+from app.modules.orion.context import ReportContext
+from app.modules.orion.html import text
+
+
+def render_document(context: ReportContext, chapters: list[str]) -> str:
+    css = (Path(__file__).resolve().parent / "report.css").read_text(encoding="utf-8")
+    title = f"Validierungsbericht {context.validation.report_number}"
+    chapter_markup = "\n".join(chapters)
+    return f"""<!doctype html>
+<html lang="de">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>{text(title)}</title>
+  <style>{css}</style>
+</head>
+<body>
+  <article class="report-document">
+    <div class="report-meta" data-report-number="{text(context.validation.report_number)}"></div>
+    {chapter_markup}
+  </article>
+</body>
+</html>"""
+
diff --git a/validation-suite/backend/mercury/app/schemas/domain.py b/validation-suite/backend/mercury/app/schemas/domain.py
index 1238af18..76e940e1 100644
--- a/validation-suite/backend/mercury/app/schemas/domain.py
+++ b/validation-suite/backend/mercury/app/schemas/domain.py
@@ -1,8 +1,9 @@
 from __future__ import annotations
 
 from datetime import date
+from uuid import UUID
 
-from pydantic import EmailStr, Field
+from pydantic import EmailStr, Field, field_validator
 
 from app.models.customer import CustomerType
 from app.models.equipment import EquipmentKind, EquipmentStatus
@@ -108,12 +109,12 @@ class EquipmentUpdate(EquipmentCreate):
 
 
 class ValidationCreate(ORMModel):
-    report_number: str
-    customer_id: str
-    location_id: str | None = None
-    contact_id: str | None = None
-    device_id: str | None = None
-    validation_type: str
+    report_number: str | None = None
+    customer_id: UUID | None = None
+    location_id: UUID | None = None
+    contact_id: UUID | None = None
+    device_id: UUID | None = None
+    validation_type: str | None = None
     project: str | None = None
     test_location: str | None = None
     examiner_name: str | None = None
@@ -122,8 +123,12 @@ class ValidationCreate(ORMModel):
     scheduled_on: date | None = None
     performed_on: date | None = None
     next_validation_on: date | None = None
-    examiner_id: str | None = None
-    status: ValidationStatus = ValidationStatus.draft
+    revalidation_interval_months: int = 24
+    next_validation_manually_overridden: bool = False
+    version: int = 1
+    previous_validation_id: UUID | None = None
+    examiner_id: UUID | None = None
+    status: ValidationStatus | str = ValidationStatus.draft
     result: str | None = None
     notes: str | None = None
     equipment_ids: list[str] = Field(default_factory=list)
@@ -137,6 +142,21 @@ class ValidationCreate(ORMModel):
     recommendations: list[dict] = Field(default_factory=list)
     attachments: list[dict] = Field(default_factory=list)
 
+    @field_validator(
+        "customer_id",
+        "location_id",
+        "contact_id",
+        "device_id",
+        "examiner_id",
+        "previous_validation_id",
+        mode="before",
+    )
+    @classmethod
+    def empty_string_to_none(cls, value):
+        if value == "":
+            return None
+        return value
+
 
 class ValidationRead(ValidationCreate, EntityRead):
     pass
@@ -144,3 +164,45 @@ class ValidationRead(ValidationCreate, EntityRead):
 
 class ValidationUpdate(ValidationCreate):
     pass
+
+
+class ValidationIssue(ORMModel):
+    field: str
+    message: str
+    section: str
+
+
+class ValidationReview(ORMModel):
+    status: str
+    errors: list[ValidationIssue]
+    warnings: list[ValidationIssue]
+    complete_sections: list[str]
+
+
+class ValidationImportPreviewRow(ORMModel):
+    row_number: int
+    data: dict
+    errors: list[str]
+    duplicate: bool
+    resolved_customer_id: str | None = None
+    resolved_location_id: str | None = None
+    resolved_device_id: str | None = None
+
+
+class ValidationImportPreview(ORMModel):
+    rows: list[ValidationImportPreviewRow]
+    valid_rows: int
+    invalid_rows: int
+    duplicates: int
+
+
+class ValidationImportRequest(ORMModel):
+    rows: list[dict]
+    duplicate_strategy: str = "skip"
+
+
+class ValidationImportSummary(ORMModel):
+    successful: int
+    skipped: int
+    failed: int
+    errors: list[str] = Field(default_factory=list)
diff --git a/validation-suite/backend/mercury/app/services/domain_service.py b/validation-suite/backend/mercury/app/services/domain_service.py
index f801b3f3..e2b1fb8c 100644
--- a/validation-suite/backend/mercury/app/services/domain_service.py
+++ b/validation-suite/backend/mercury/app/services/domain_service.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from typing import TypeVar
+from uuid import UUID
 
 from sqlalchemy.orm import Session
 
@@ -41,16 +42,33 @@ class CrudService:
         }
 
     def create(self, data: dict) -> ModelT:
+        data = self._normalize(data)
         return self.repository.add(self.repository.model(**data))
 
     def update(self, item_id: str, data: dict) -> ModelT:
+        data = self._normalize(data)
         item = self.repository.get(item_id)
         if item is None:
             raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Resource not found")
+        if isinstance(item, Validation) and item.status in {"FREIGEGEBEN", "ABGESCHLOSSEN"}:
+            raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="Freigegebene oder abgeschlossene Validierungen sind schreibgeschuetzt")
         for key, value in data.items():
             setattr(item, key, value)
         return item
 
+    def _normalize(self, data: dict) -> dict:
+        normalized = {}
+        for key, value in data.items():
+            if key.endswith("_id") and value == "":
+                normalized[key] = None
+            elif isinstance(value, UUID):
+                normalized[key] = str(value)
+            elif isinstance(value, list):
+                normalized[key] = [str(item) if isinstance(item, UUID) else item for item in value]
+            else:
+                normalized[key] = value
+        return normalized
+
     def delete(self, item_id: str) -> None:
         item = self.repository.get(item_id)
         if item is None:
diff --git a/validation-suite/backend/mercury/app/services/validation_workflow.py b/validation-suite/backend/mercury/app/services/validation_workflow.py
new file mode 100644
index 00000000..81981751
--- /dev/null
+++ b/validation-suite/backend/mercury/app/services/validation_workflow.py
@@ -0,0 +1,344 @@
+from __future__ import annotations
+
+import csv
+import io
+from dataclasses import dataclass
+from datetime import date, datetime
+from uuid import uuid4
+
+from dateutil.relativedelta import relativedelta
+from sqlalchemy import and_, or_, select
+from sqlalchemy.orm import Session
+
+from app.models.contact import Contact
+from app.models.customer import Customer
+from app.models.device import Device
+from app.models.equipment import Equipment
+from app.models.location import Location
+from app.models.validation import Validation, ValidationStatus
+
+REQUIRED_FIELDS = {
+    "report_number": ("Allgemeine Angaben", "Berichtsnummer"),
+    "validation_type": ("Allgemeine Angaben", "Validierungsart"),
+    "performed_on": ("Allgemeine Angaben", "Pruefdatum"),
+    "customer_id": ("Kunde und Standort", "Kunde"),
+    "location_id": ("Kunde und Standort", "Standort"),
+    "device_id": ("Geraet", "Geraet"),
+    "examiner_name": ("Allgemeine Angaben", "Pruefer"),
+}
+
+
+@dataclass(frozen=True)
+class ReviewIssue:
+    field: str
+    message: str
+    section: str
+
+    def as_dict(self) -> dict[str, str]:
+        return {"field": self.field, "message": self.message, "section": self.section}
+
+
+class ValidationWorkflowService:
+    def __init__(self, session: Session) -> None:
+        self.session = session
+
+    def review(self, validation: Validation) -> dict:
+        errors = self._required_errors(validation) + self._reference_errors(validation)
+        warnings = self._warnings(validation)
+        complete_sections = self._complete_sections(validation, errors, warnings)
+        return {
+            "status": validation.status,
+            "errors": [issue.as_dict() for issue in errors],
+            "warnings": [issue.as_dict() for issue in warnings],
+            "complete_sections": complete_sections,
+        }
+
+    def mark_ready_for_review(self, validation: Validation) -> dict:
+        review = self.review(validation)
+        validation.status = (
+            ValidationStatus.ready_for_review.value
+            if not review["errors"]
+            else ValidationStatus.draft.value
+        )
+        self.session.flush()
+        review["status"] = validation.status
+        return review
+
+    def apply_revalidation_date(self, validation: Validation) -> None:
+        if validation.performed_on and not validation.next_validation_manually_overridden:
+            validation.next_validation_on = validation.performed_on + relativedelta(
+                months=validation.revalidation_interval_months or 24
+            )
+
+    def duplicate(self, validation: Validation) -> Validation:
+        clone = Validation(
+            report_number=f"{validation.report_number}-KOPIE-{str(uuid4())[:8]}",
+            customer_id=validation.customer_id,
+            location_id=validation.location_id,
+            contact_id=validation.contact_id,
+            device_id=validation.device_id,
+            validation_type=validation.validation_type,
+            project=validation.project,
+            test_location=validation.test_location,
+            examiner_name=validation.examiner_name,
+            participants=validation.participants,
+            operator_name=validation.operator_name,
+            scheduled_on=validation.scheduled_on,
+            performed_on=validation.performed_on,
+            next_validation_on=validation.next_validation_on,
+            revalidation_interval_months=validation.revalidation_interval_months,
+            next_validation_manually_overridden=validation.next_validation_manually_overridden,
+            version=validation.version + 1,
+            previous_validation_id=validation.id,
+            examiner_id=validation.examiner_id,
+            status=ValidationStatus.draft.value,
+            result=validation.result,
+            notes=validation.notes,
+            equipment_ids=validation.equipment_ids,
+            environment_conditions=validation.environment_conditions,
+            documentation_checklist=validation.documentation_checklist,
+            performance_checklist=validation.performance_checklist,
+            programs=validation.programs,
+            loading_patterns=validation.loading_patterns,
+            measurement_data=validation.measurement_data,
+            drying=validation.drying,
+            recommendations=validation.recommendations,
+            attachments=validation.attachments,
+        )
+        self.session.add(clone)
+        self.session.flush()
+        return clone
+
+    def create_new_version(self, validation: Validation) -> Validation:
+        clone = self.duplicate(validation)
+        clone.report_number = f"{validation.report_number}-V{clone.version}"
+        return clone
+
+    def export_json(self, validation: Validation) -> dict:
+        return {
+            column.name: getattr(validation, column.name)
+            for column in Validation.__table__.columns
+            if column.name not in {"created_at", "updated_at"}
+        }
+
+    def preview_csv(self, content: bytes) -> dict:
+        rows = []
+        reader = csv.DictReader(io.StringIO(content.decode("utf-8-sig")))
+        for index, row in enumerate(reader, start=2):
+            rows.append(self._preview_import_row(index, row))
+        return {
+            "rows": rows,
+            "valid_rows": sum(1 for row in rows if not row["errors"]),
+            "invalid_rows": sum(1 for row in rows if row["errors"]),
+            "duplicates": sum(1 for row in rows if row["duplicate"]),
+        }
+
+    def import_rows(self, rows: list[dict], duplicate_strategy: str) -> dict:
+        summary = {"successful": 0, "skipped": 0, "failed": 0, "errors": []}
+        for index, row in enumerate(rows, start=1):
+            preview = self._preview_import_row(index, row)
+            if preview["errors"]:
+                summary["failed"] += 1
+                summary["errors"].append(f"Zeile {index}: {', '.join(preview['errors'])}")
+                continue
+            existing = self.session.scalar(
+                select(Validation).where(Validation.report_number == row.get("report_number"))
+            )
+            if existing and duplicate_strategy == "skip":
+                summary["skipped"] += 1
+                continue
+            target = existing if existing and duplicate_strategy == "update" else Validation()
+            target.report_number = (
+                f"{row.get('report_number')}-IMPORT-{str(uuid4())[:8]}"
+                if existing and duplicate_strategy == "copy"
+                else row.get("report_number")
+            )
+            target.validation_type = row.get("validation_type")
+            target.performed_on = self._parse_date(row.get("test_date") or row.get("performed_on"))
+            target.customer_id = preview["resolved_customer_id"]
+            target.location_id = preview["resolved_location_id"]
+            target.contact_id = row.get("contact_id")
+            target.device_id = preview["resolved_device_id"]
+            target.examiner_name = row.get("examiner") or row.get("examiner_name")
+            target.project = row.get("project")
+            target.test_location = row.get("test_location")
+            target.participants = row.get("participants")
+            target.operator_name = row.get("operator_name")
+            target.next_validation_on = self._parse_date(row.get("next_validation_on"))
+            target.equipment_ids = row.get("equipment_ids") or []
+            target.environment_conditions = row.get("environment_conditions") or {}
+            target.documentation_checklist = row.get("documentation_checklist") or []
+            target.performance_checklist = row.get("performance_checklist") or []
+            target.programs = row.get("programs") or []
+            target.loading_patterns = row.get("loading_patterns") or []
+            target.measurement_data = row.get("measurement_data") or []
+            target.drying = row.get("drying") or {}
+            target.recommendations = row.get("recommendations") or []
+            target.attachments = row.get("attachments") or []
+            target.status = row.get("status") or ValidationStatus.draft.value
+            target.result = row.get("result")
+            target.notes = row.get("notes")
+            if target.id is None:
+                self.session.add(target)
+            summary["successful"] += 1
+        self.session.flush()
+        return summary
+
+    def query_validations(
+        self,
+        search: str | None,
+        page: int,
+        page_size: int,
+        sort_by: str,
+        sort_order: str,
+        filters: dict,
+    ) -> dict:
+        statement = select(Validation)
+        count_statement = select(Validation)
+        conditions = []
+        if search:
+            term = f"%{search}%"
+            conditions.append(
+                or_(
+                    Validation.report_number.ilike(term),
+                    Validation.validation_type.ilike(term),
+                    Validation.examiner_name.ilike(term),
+                    Validation.result.ilike(term),
+                )
+            )
+        for key in ["status", "customer_id", "device_id", "validation_type", "result"]:
+            if filters.get(key):
+                conditions.append(getattr(Validation, key) == filters[key])
+        if filters.get("date_from"):
+            conditions.append(Validation.performed_on >= filters["date_from"])
+        if filters.get("date_to"):
+            conditions.append(Validation.performed_on <= filters["date_to"])
+        if filters.get("overdue_only"):
+            conditions.append(Validation.next_validation_on < date.today())
+            conditions.append(Validation.status != ValidationStatus.cancelled.value)
+        if conditions:
+            statement = statement.where(and_(*conditions))
+            count_statement = count_statement.where(and_(*conditions))
+        sort_column = getattr(Validation, sort_by, Validation.updated_at)
+        if sort_order == "asc":
+            statement = statement.order_by(sort_column.asc())
+        else:
+            statement = statement.order_by(sort_column.desc())
+        total = len(list(self.session.scalars(count_statement)))
+        items = list(self.session.scalars(statement.offset((page - 1) * page_size).limit(page_size)))
+        return {"items": items, "total": total, "page": page, "page_size": page_size}
+
+    def revalidation_status(self, validation: Validation) -> str:
+        if not validation.next_validation_on:
+            return "nicht_erfasst"
+        delta = (validation.next_validation_on - date.today()).days
+        if delta < 0:
+            return "ueberfaellig"
+        if delta <= 30:
+            return "faellig_30"
+        if delta <= 90:
+            return "faellig_90"
+        return "faellig_spaeter"
+
+    def _required_errors(self, validation: Validation) -> list[ReviewIssue]:
+        issues = []
+        for field, (section, label) in REQUIRED_FIELDS.items():
+            if not getattr(validation, field):
+                issues.append(ReviewIssue(field, f"{label} fehlt.", section))
+        return issues
+
+    def _reference_errors(self, validation: Validation) -> list[ReviewIssue]:
+        issues = []
+        customer = self.session.get(Customer, validation.customer_id) if validation.customer_id else None
+        location = self.session.get(Location, validation.location_id) if validation.location_id else None
+        device = self.session.get(Device, validation.device_id) if validation.device_id else None
+        if validation.customer_id and customer is None:
+            issues.append(ReviewIssue("customer_id", "Kunde existiert nicht.", "Kunde und Standort"))
+        if validation.location_id and location is None:
+            issues.append(ReviewIssue("location_id", "Standort existiert nicht.", "Kunde und Standort"))
+        if validation.device_id and device is None:
+            issues.append(ReviewIssue("device_id", "Geraet existiert nicht.", "Geraet"))
+        if location and device and device.location_id != location.id:
+            issues.append(ReviewIssue("device_id", "Geraet gehoert nicht zum gewaehlten Standort.", "Geraet"))
+        return issues
+
+    def _warnings(self, validation: Validation) -> list[ReviewIssue]:
+        warnings = []
+        equipment = []
+        if validation.equipment_ids:
+            equipment = list(self.session.scalars(select(Equipment).where(Equipment.id.in_(validation.equipment_ids))))
+        if not validation.equipment_ids:
+            warnings.append(ReviewIssue("equipment_ids", "Keine Pruefmittel ausgewaehlt.", "Pruefmittel"))
+        for item in equipment:
+            if item.calibration_due_on and item.calibration_due_on < date.today():
+                warnings.append(ReviewIssue("equipment_ids", f"Pruefmittel {item.serial_number} ist abgelaufen.", "Pruefmittel"))
+        if not any(item.get("selected") for item in validation.programs or []):
+            warnings.append(ReviewIssue("programs", "Keine Programme ausgewaehlt.", "Programme"))
+        if not validation.measurement_data:
+            warnings.append(ReviewIssue("measurement_data", "Keine Messdaten vorhanden.", "Messdaten"))
+        if not validation.attachments:
+            warnings.append(ReviewIssue("attachments", "Keine Bilder oder Anlagen vorhanden.", "Bilder und Anlagen"))
+        if not validation.recommendations:
+            warnings.append(ReviewIssue("recommendations", "Keine Empfehlungen oder Auflagen erfasst.", "Empfehlungen"))
+        winlog_imported = any(item.get("imports") for item in validation.measurement_data or [])
+        if not winlog_imported:
+            warnings.append(ReviewIssue("measurement_data", "Winlog-Datei noch nicht importiert.", "Messdaten"))
+        return warnings
+
+    def _complete_sections(
+        self, validation: Validation, errors: list[ReviewIssue], warnings: list[ReviewIssue]
+    ) -> list[str]:
+        blocked = {issue.section for issue in [*errors, *warnings]}
+        sections = [
+            "Allgemeine Angaben",
+            "Kunde und Standort",
+            "Geraet",
+            "Pruefmittel",
+            "Programme",
+            "Messdaten",
+            "Bilder und Anlagen",
+            "Empfehlungen",
+        ]
+        return [section for section in sections if section not in blocked]
+
+    def _preview_import_row(self, row_number: int, row: dict) -> dict:
+        errors = []
+        customer = self.session.get(Customer, row.get("customer_id")) if row.get("customer_id") else self.session.scalar(select(Customer).where(Customer.name == row.get("customer_reference")))
+        location = self.session.get(Location, row.get("location_id")) if row.get("location_id") else self.session.scalar(select(Location).where(Location.name == row.get("location_reference")))
+        device = self.session.get(Device, row.get("device_id")) if row.get("device_id") else self.session.scalar(select(Device).where(Device.serial_number == row.get("device_serial_number")))
+        duplicate = bool(
+            row.get("report_number")
+            and self.session.scalar(select(Validation).where(Validation.report_number == row.get("report_number")))
+        )
+        required = [
+            ("report_number", row.get("report_number")),
+            ("validation_type", row.get("validation_type")),
+            ("test_date", row.get("test_date") or row.get("performed_on")),
+            ("customer_reference", row.get("customer_reference") or row.get("customer_id")),
+            ("location_reference", row.get("location_reference") or row.get("location_id")),
+            ("device_serial_number", row.get("device_serial_number") or row.get("device_id")),
+            ("examiner", row.get("examiner") or row.get("examiner_name")),
+        ]
+        for field, value in required:
+            if not value:
+                errors.append(f"{field} fehlt")
+        if row.get("customer_reference") and not customer:
+            errors.append("Kunde nicht gefunden")
+        if row.get("location_reference") and not location:
+            errors.append("Standort nicht gefunden")
+        if row.get("device_serial_number") and not device:
+            errors.append("Geraet nicht gefunden")
+        return {
+            "row_number": row_number,
+            "data": row,
+            "errors": errors,
+            "duplicate": duplicate,
+            "resolved_customer_id": customer.id if customer else None,
+            "resolved_location_id": location.id if location else None,
+            "resolved_device_id": device.id if device else None,
+        }
+
+    def _parse_date(self, value: str | None) -> date | None:
+        if not value:
+            return None
+        return datetime.strptime(value, "%Y-%m-%d").date()
diff --git a/validation-suite/backend/mercury/pyproject.toml b/validation-suite/backend/mercury/pyproject.toml
index caf0a669..88f0b0d7 100644
--- a/validation-suite/backend/mercury/pyproject.toml
+++ b/validation-suite/backend/mercury/pyproject.toml
@@ -13,13 +13,14 @@ dependencies = [
   "pydantic[email]==2.11.7",
   "python-jose[cryptography]==3.5.0",
   "python-multipart==0.0.20",
+  "python-dateutil==2.9.0.post0",
   "sqlalchemy==2.0.41",
   "uvicorn[standard]==0.35.0",
   "weasyprint==62.3"
 ]
 
 [project.optional-dependencies]
-dev = ["black==25.1.0", "isort==6.0.1", "ruff==0.12.4"]
+dev = ["black==25.1.0", "isort==6.0.1", "pytest==8.3.4", "ruff==0.12.4"]
 
 [tool.black]
 line-length = 100
@@ -31,3 +32,5 @@ profile = "black"
 line-length = 100
 target-version = "py312"
 
+[tool.setuptools.packages.find]
+include = ["app*"]
diff --git a/validation-suite/backend/mercury/tests/test_validation_workflow.py b/validation-suite/backend/mercury/tests/test_validation_workflow.py
new file mode 100644
index 00000000..b669af81
--- /dev/null
+++ b/validation-suite/backend/mercury/tests/test_validation_workflow.py
@@ -0,0 +1,225 @@
+from __future__ import annotations
+
+from datetime import date
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import Session
+
+from app.db.base import Base
+from app.models.customer import Customer, CustomerType
+from app.models.contact import Contact
+from app.models.device import Device
+from app.models.location import Location
+from app.models.validation import Validation, ValidationStatus
+from app.services.validation_workflow import ValidationWorkflowService
+from app.schemas.domain import ValidationCreate
+from app.modules.orion.service import OrionReportService
+
+
+def session() -> Session:
+    engine = create_engine("sqlite+pysqlite:///:memory:")
+    Base.metadata.create_all(engine)
+    return Session(engine)
+
+
+def seed(session: Session):
+    customer = Customer(customer_type=CustomerType.practice, name="Praxis Test")
+    session.add(customer)
+    session.flush()
+    location = Location(customer_id=customer.id, name="OP")
+    session.add(location)
+    session.flush()
+    device = Device(
+        customer_id=customer.id,
+        location_id=location.id,
+        manufacturer="MELAG",
+        model="Vacuklav",
+        serial_number="SN-1",
+    )
+    session.add(device)
+    session.flush()
+    return customer, location, device
+
+
+def seed_contact(session: Session, customer: Customer) -> Contact:
+    contact = Contact(customer_id=customer.id, full_name="Kontakt")
+    session.add(contact)
+    session.flush()
+    return contact
+
+
+def valid_validation(customer: Customer, location: Location, device: Device) -> Validation:
+    return Validation(
+        report_number="VAL-TEST-1",
+        validation_type="Erstvalidierung",
+        performed_on=date.today(),
+        customer_id=customer.id,
+        location_id=location.id,
+        device_id=device.id,
+        examiner_name="Pruefer",
+        status=ValidationStatus.draft.value,
+    )
+
+
+def test_required_fields_are_reported():
+    db = session()
+    validation = Validation(status=ValidationStatus.draft.value)
+
+    review = ValidationWorkflowService(db).review(validation)
+
+    assert {item["field"] for item in review["errors"]} >= {
+        "report_number",
+        "validation_type",
+        "performed_on",
+        "customer_id",
+        "location_id",
+        "device_id",
+        "examiner_name",
+    }
+
+
+def test_status_changes_to_ready_when_no_errors():
+    db = session()
+    customer, location, device = seed(db)
+    validation = valid_validation(customer, location, device)
+    db.add(validation)
+    db.flush()
+
+    review = ValidationWorkflowService(db).mark_ready_for_review(validation)
+
+    assert review["errors"] == []
+    assert validation.status == ValidationStatus.ready_for_review.value
+
+
+def test_search_finds_report_number():
+    db = session()
+    customer, location, device = seed(db)
+    db.add(valid_validation(customer, location, device))
+    db.flush()
+
+    result = ValidationWorkflowService(db).query_validations(
+        search="VAL-TEST",
+        page=1,
+        page_size=10,
+        sort_by="updated_at",
+        sort_order="desc",
+        filters={},
+    )
+
+    assert result["total"] == 1
+
+
+def test_csv_import_preview_detects_duplicate_and_missing_fields():
+    db = session()
+    customer, location, device = seed(db)
+    db.add(valid_validation(customer, location, device))
+    db.flush()
+    csv_content = (
+        "report_number,validation_type,test_date,customer_reference,location_reference,"
+        "device_serial_number,examiner,status,result,notes\n"
+        "VAL-TEST-1,Erstvalidierung,2026-07-11,Praxis Test,OP,SN-1,Pruefer,ENTWURF,offen,\n"
+        "VAL-NEW,,,,,,,\n"
+    ).encode()
+
+    preview = ValidationWorkflowService(db).preview_csv(csv_content)
+
+    assert preview["duplicates"] == 1
+    assert preview["invalid_rows"] == 1
+
+
+def test_validation_without_contact_id_can_be_saved():
+    db = session()
+    customer, location, device = seed(db)
+    validation = valid_validation(customer, location, device)
+    validation.contact_id = None
+    db.add(validation)
+    db.flush()
+
+    assert validation.contact_id is None
+
+
+def test_validation_with_valid_contact_id_can_be_saved():
+    db = session()
+    customer, location, device = seed(db)
+    contact = seed_contact(db, customer)
+    validation = valid_validation(customer, location, device)
+    validation.contact_id = contact.id
+    db.add(validation)
+    db.flush()
+
+    assert validation.contact_id == contact.id
+
+
+def test_empty_contact_id_string_is_normalized_to_none():
+    payload = ValidationCreate(
+        report_number="VAL-EMPTY",
+        validation_type="Erstvalidierung",
+        performed_on=date.today(),
+        customer_id=None,
+        location_id="",
+        contact_id="",
+        device_id=None,
+        examiner_name="Pruefer",
+    )
+
+    assert payload.contact_id is None
+    assert payload.location_id is None
+
+
+def test_invalid_uuid_returns_validation_error():
+    try:
+        ValidationCreate(
+            report_number="VAL-BAD",
+            validation_type="Erstvalidierung",
+            performed_on=date.today(),
+            customer_id="not-a-uuid",
+            device_id=None,
+            examiner_name="Pruefer",
+        )
+    except Exception as exc:
+        assert "uuid" in str(exc).lower()
+    else:
+        raise AssertionError("Invalid UUID was accepted")
+
+
+def test_revalidation_date_uses_calendar_months():
+    db = session()
+    customer, location, device = seed(db)
+    validation = valid_validation(customer, location, device)
+    validation.performed_on = date(2026, 1, 31)
+    validation.revalidation_interval_months = 1
+
+    ValidationWorkflowService(db).apply_revalidation_date(validation)
+
+    assert validation.next_validation_on == date(2026, 2, 28)
+
+
+def test_new_version_keeps_structured_json_and_previous_reference():
+    db = session()
+    customer, location, device = seed(db)
+    validation = valid_validation(customer, location, device)
+    validation.status = ValidationStatus.approved.value
+    validation.documentation_checklist = [{"text": "A", "value": "yes"}]
+    db.add(validation)
+    db.flush()
+
+    clone = ValidationWorkflowService(db).create_new_version(validation)
+
+    assert clone.previous_validation_id == validation.id
+    assert clone.version == 2
+    assert clone.documentation_checklist == validation.documentation_checklist
+
+
+def test_orion_renders_reference_main_chapters(tmp_path):
+    db = session()
+    customer, location, device = seed(db)
+    validation = valid_validation(customer, location, device)
+    db.add(validation)
+    db.flush()
+
+    html = OrionReportService(db, tmp_path).render_html(validation.id)
+
+    assert "1. Funktionsqualifikation" in html
+    assert "2.2 Pruefmittel" in html
+    assert "4. Ergebnisse der Validierung" in html
+    assert "9. Kalibrierzertifikate" in html
diff --git a/validation-suite/frontend/atlas/app/(app)/dashboard/page.tsx b/validation-suite/frontend/atlas/app/(app)/dashboard/page.tsx
index 1f739d5c..d020bdd3 100644
--- a/validation-suite/frontend/atlas/app/(app)/dashboard/page.tsx
+++ b/validation-suite/frontend/atlas/app/(app)/dashboard/page.tsx
@@ -1,26 +1,25 @@
 "use client";
 
 import { useQuery } from "@tanstack/react-query";
-import { Building2, Gauge, MapPin, Stethoscope, UserRound } from "lucide-react";
+import { AlertTriangle, CheckCircle2, ClipboardList, Clock, FilePenLine } from "lucide-react";
 import Link from "next/link";
 import { useAuth } from "@/components/auth";
 import { apiGet } from "@/lib/api";
 
 type DashboardData = {
-  customers: number;
-  locations: number;
-  contacts: number;
-  devices: number;
-  equipment: number;
-  validations: number;
+  validation_drafts: number;
+  validation_ready: number;
+  validation_in_review: number;
+  validation_approved: number;
+  validation_overdue: number;
 };
 
 const cards = [
-  { label: "Kunden", key: "customers", href: "/customers", icon: Building2 },
-  { label: "Standorte", key: "locations", href: "/locations", icon: MapPin },
-  { label: "Ansprechpartner", key: "contacts", href: "/contacts", icon: UserRound },
-  { label: "Geraete", key: "devices", href: "/devices", icon: Stethoscope },
-  { label: "Pruefmittel", key: "equipment", href: "/equipment", icon: Gauge }
+  { label: "Entwuerfe", key: "validation_drafts", href: "/validations?status=ENTWURF", icon: FilePenLine },
+  { label: "Bereit zur Pruefung", key: "validation_ready", href: "/validations?status=BEREIT_ZUR_PRUEFUNG", icon: ClipboardList },
+  { label: "In Pruefung", key: "validation_in_review", href: "/validations?status=IN_PRUEFUNG", icon: Clock },
+  { label: "Freigegeben", key: "validation_approved", href: "/validations?status=FREIGEGEBEN", icon: CheckCircle2 },
+  { label: "Ueberfaellige Revalidierungen", key: "validation_overdue", href: "/validations?overdue_only=true", icon: AlertTriangle }
 ] as const;
 
 export default function DashboardPage() {
@@ -35,7 +34,7 @@ export default function DashboardPage() {
     <div className="space-y-8">
       <header>
         <h1 className="text-3xl font-semibold text-text">Dashboard</h1>
-        <p className="mt-2 text-text-light">Aktuelle Stammdaten aus PostgreSQL.</p>
+        <p className="mt-2 text-text-light">Validierungsworkflow und faellige Revalidierungen.</p>
       </header>
       <section className="grid gap-4 sm:grid-cols-2 xl:grid-cols-5">
         {cards.map((item) => {
@@ -52,8 +51,8 @@ export default function DashboardPage() {
         })}
       </section>
       <section className="rounded-lg border border-border bg-surface p-6 shadow-soft">
-        <h2 className="text-xl font-semibold">Stammdaten</h2>
-        <p className="mt-2 text-sm leading-6 text-text-light">Kunden, Standorte, Ansprechpartner, Geraete und Pruefmittel koennen produktiv angelegt, bearbeitet, gesucht und geloescht werden.</p>
+        <h2 className="text-xl font-semibold">Zuletzt bearbeitete Validierungen</h2>
+        <p className="mt-2 text-sm leading-6 text-text-light">Die Validierungsverwaltung bietet Suche, Filter, Sortierung, Vorschau, Export und Workflow-Aktionen.</p>
       </section>
     </div>
   );
diff --git a/validation-suite/frontend/atlas/app/(app)/validations/[id]/edit/page.tsx b/validation-suite/frontend/atlas/app/(app)/validations/[id]/edit/page.tsx
new file mode 100644
index 00000000..c52ad99c
--- /dev/null
+++ b/validation-suite/frontend/atlas/app/(app)/validations/[id]/edit/page.tsx
@@ -0,0 +1,9 @@
+"use client";
+
+import { useParams } from "next/navigation";
+import ValidationEditor from "@/components/validations/validation-editor";
+
+export default function EditValidationPage() {
+  const params = useParams<{ id: string }>();
+  return <ValidationEditor validationId={params.id} />;
+}
diff --git a/validation-suite/frontend/atlas/app/(app)/validations/[id]/preview/page.tsx b/validation-suite/frontend/atlas/app/(app)/validations/[id]/preview/page.tsx
new file mode 100644
index 00000000..5930fb1d
--- /dev/null
+++ b/validation-suite/frontend/atlas/app/(app)/validations/[id]/preview/page.tsx
@@ -0,0 +1,60 @@
+"use client";
+
+import { ArrowLeft, Download } from "lucide-react";
+import Link from "next/link";
+import { useParams } from "next/navigation";
+import { useEffect, useState } from "react";
+import { useAuth } from "@/components/auth";
+import { API_BASE } from "@/lib/api";
+
+export default function ValidationPreviewPage() {
+  const { token } = useAuth();
+  const params = useParams<{ id: string }>();
+  const [html, setHtml] = useState("");
+  const [message, setMessage] = useState("Vorschau wird geladen.");
+
+  useEffect(() => {
+    if (!token || !params.id) return;
+    fetch(`${API_BASE}/validations/${params.id}/report.html`, {
+      headers: { Authorization: `Bearer ${token}` }
+    })
+      .then(async (response) => {
+        if (!response.ok) throw new Error(await response.text());
+        return response.text();
+      })
+      .then((content) => {
+        setHtml(content);
+        setMessage("");
+      })
+      .catch(() => setMessage("Vorschau konnte nicht geladen werden."));
+  }, [params.id, token]);
+
+  async function downloadPdf() {
+    const response = await fetch(`${API_BASE}/validations/${params.id}/report.pdf`, {
+      headers: { Authorization: `Bearer ${token}` }
+    });
+    const blob = await response.blob();
+    const url = URL.createObjectURL(blob);
+    const link = document.createElement("a");
+    link.href = url;
+    link.download = "validierungsbericht.pdf";
+    link.click();
+    URL.revokeObjectURL(url);
+  }
+
+  return (
+    <div className="space-y-5">
+      <header className="flex flex-col justify-between gap-3 sm:flex-row sm:items-center">
+        <div>
+          <h1 className="text-3xl font-semibold">HTML-Vorschau</h1>
+          <p className="mt-2 text-text-light">Authentifiziert gerenderter Orion-Bericht.</p>
+        </div>
+        <div className="flex gap-2">
+          <Link href="/validations" className="btn btn-secondary h-12"><ArrowLeft className="h-4 w-4" /> Zurueck</Link>
+          <button type="button" onClick={downloadPdf} className="btn btn-primary h-12"><Download className="h-4 w-4" /> PDF herunterladen</button>
+        </div>
+      </header>
+      {message ? <div className="rounded-lg border border-border bg-surface p-6 shadow-soft">{message}</div> : <iframe title="Validierungsbericht" srcDoc={html} className="h-[78vh] w-full rounded-lg border border-border bg-white shadow-soft" />}
+    </div>
+  );
+}
diff --git a/validation-suite/frontend/atlas/app/(app)/validations/new/page.tsx b/validation-suite/frontend/atlas/app/(app)/validations/new/page.tsx
new file mode 100644
index 00000000..d97159c9
--- /dev/null
+++ b/validation-suite/frontend/atlas/app/(app)/validations/new/page.tsx
@@ -0,0 +1,5 @@
+import ValidationEditor from "@/components/validations/validation-editor";
+
+export default function NewValidationPage() {
+  return <ValidationEditor />;
+}
diff --git a/validation-suite/frontend/atlas/app/(app)/validations/page.tsx b/validation-suite/frontend/atlas/app/(app)/validations/page.tsx
index 41118b82..68518064 100644
--- a/validation-suite/frontend/atlas/app/(app)/validations/page.tsx
+++ b/validation-suite/frontend/atlas/app/(app)/validations/page.tsx
@@ -1,361 +1,205 @@
 "use client";
 
-import { zodResolver } from "@hookform/resolvers/zod";
 import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
-import { ChevronDown, Download, FileText, Plus, Save, ShieldCheck, UploadCloud, X } from "lucide-react";
-import { useEffect, useMemo, useRef, useState } from "react";
-import { Controller, useFieldArray, useForm, useWatch } from "react-hook-form";
-import { z } from "zod";
+import { ColumnDef, flexRender, getCoreRowModel, getSortedRowModel, SortingState, useReactTable } from "@tanstack/react-table";
+import { Copy, Download, Edit2, Eye, FilePlus2, GitBranchPlus, Search, Trash2, XCircle } from "lucide-react";
+import Link from "next/link";
+import { useEffect, useMemo, useState } from "react";
 import { useAuth } from "@/components/auth";
-import { apiGet, apiSend, Contact, Customer, Device, Equipment, Location, Paginated, ValidationItem } from "@/lib/api";
+import { API_BASE, apiDelete, apiGet, apiSend, Customer, Device, Paginated, ValidationItem } from "@/lib/api";
 
-const triState = ["yes", "no", "na"] as const;
-const today = new Date().toISOString().slice(0, 10);
+const statusLabels: Record<string, string> = {
+  ENTWURF: "Entwurf",
+  BEREIT_ZUR_PRUEFUNG: "Bereit zur Pruefung",
+  IN_PRUEFUNG: "In Pruefung",
+  FREIGEGEBEN: "Freigegeben",
+  ABGESCHLOSSEN: "Abgeschlossen",
+  STORNIERT: "Storniert"
+};
 
-const checklistTexts = [
-  "Gebrauchsanweisung und Herstellerdokumentation vorhanden",
-  "Wartungsnachweise vollstaendig",
-  "Kalibrierzertifikate der Pruefmittel gueltig",
-  "Aufstellbedingungen dokumentiert",
-  "Wasserqualitaet dokumentiert",
-  "Chargendokumentation nachvollziehbar",
-  "Routinekontrollen definiert",
-  "Freigabeverfahren beschrieben",
-  "Personal eingewiesen",
-  "Abweichungen bewertet"
-];
-
-const performanceTexts = [
-  "Vakuumtest entspricht Vorgaben",
-  "Bowie-Dick / Leerkammerprofil entspricht Vorgaben",
-  "Temperaturband innerhalb Spezifikation",
-  "Haltezeit erreicht",
-  "Druckverlauf plausibel",
-  "Trocknungsergebnis akzeptabel",
-  "Beladungsmuster reproduzierbar",
-  "Sensorpositionen dokumentiert"
-];
-
-const attachmentCategories = [
-  "Aufbereitungsraum",
-  "reiner Bereich",
-  "unreiner Bereich",
-  "Sterilisator",
-  "Beladung",
-  "Sensorposition",
-  "Chargenprotokoll",
-  "Indikator",
-  "Zertifikat",
-  "Kalibrierschein",
-  "Winlog-Auswertung"
-];
-
-const schema = z.object({
-  report_number: z.string().min(3),
-  validation_type: z.string().min(1),
-  project: z.string().min(1),
-  performed_on: z.string().min(1),
-  test_location: z.string().min(1),
-  examiner_name: z.string().min(1),
-  participants: z.string().optional(),
-  status: z.string().min(1),
-  result: z.string().min(1),
-  customer_id: z.string().min(1),
-  location_id: z.string().optional().nullable(),
-  contact_id: z.string().optional().nullable(),
-  operator_name: z.string().optional(),
-  device_id: z.string().min(1),
-  equipment_ids: z.array(z.string()),
-  environment_conditions: z.record(z.unknown()),
-  documentation_checklist: z.array(z.record(z.unknown())),
-  performance_checklist: z.array(z.record(z.unknown())),
-  programs: z.array(z.record(z.unknown())),
-  loading_patterns: z.array(z.record(z.unknown())),
-  measurement_data: z.array(z.record(z.unknown())),
-  drying: z.record(z.unknown()),
-  recommendations: z.array(z.record(z.unknown())),
-  attachments: z.array(z.record(z.unknown()))
-});
-
-type FormValues = z.infer<typeof schema>;
-
-function checklist(items: string[]) {
-  return items.map((text, index) => ({ number: index + 1, text, value: "na", comment: "" }));
-}
-
-function defaults(reportNumber = ""): FormValues {
-  return {
-    report_number: reportNumber,
-    validation_type: "Erstvalidierung",
-    project: "",
-    performed_on: today,
-    test_location: "",
-    examiner_name: "",
-    participants: "",
-    status: "draft",
-    result: "offen",
-    customer_id: "",
-    location_id: "",
-    contact_id: "",
-    operator_name: "",
-    device_id: "",
-    equipment_ids: [],
-    environment_conditions: {
-      room_temperature: "",
-      humidity: "",
-      test_time: "",
-      checks: [
-        { text: "Raumbedingungen stabil", value: "na", comment: "" },
-        { text: "Aufstellort frei zugaenglich", value: "na", comment: "" },
-        { text: "Medienversorgung verfuegbar", value: "na", comment: "" }
-      ]
-    },
-    documentation_checklist: checklist(checklistTexts),
-    performance_checklist: checklist(performanceTexts),
-    programs: [
-      { name: "Vakuumtest", selected: false, custom: false },
-      { name: "Bowie-Dick / Leerkammerprofil", selected: false, custom: false },
-      { name: "134 C hohl verpackt", selected: false, custom: false }
-    ],
-    loading_patterns: [1, 2, 3].map((run) => ({ run, pattern: "", description: "", images: [] })),
-    measurement_data: ["Vakuumtest", "Leerkammerprofil", "Testlauf 1", "Testlauf 2", "Testlauf 3"].map((name) => ({
-      name,
-      start_time: "",
-      end_time: "",
-      duration: "",
-      leak_rate: "",
-      min_temperature: "",
-      max_temperature: "",
-      temperature_band: "",
-      equilibration_time: "",
-      holding_time: "",
-      pressure: "",
-      result: "",
-      imports: []
-    })),
-    drying: { start_weight: "", end_weight: "", difference: "", rating: "", comment: "" },
-    recommendations: [],
-    attachments: []
-  };
-}
-
-function Accordion({ title, children, defaultOpen = false }: { title: string; children: React.ReactNode; defaultOpen?: boolean }) {
-  const [open, setOpen] = useState(defaultOpen);
-  return (
-    <section className="rounded-lg border border-border bg-surface shadow-soft">
-      <button type="button" onClick={() => setOpen((value) => !value)} className="flex w-full items-center justify-between px-5 py-4 text-left text-lg font-semibold">
-        {title}
-        <ChevronDown className={`h-5 w-5 transition ${open ? "rotate-180" : ""}`} />
-      </button>
-      {open && <div className="border-t border-border p-5">{children}</div>}
-    </section>
-  );
-}
-
-function Field({ label, children }: { label: string; children: React.ReactNode }) {
-  return <label className="block"><span className="text-sm font-medium text-text">{label}</span><div className="mt-2">{children}</div></label>;
-}
-
-const inputClass = "h-12 w-full rounded-lg border border-border bg-white px-4 outline-none focus:border-primary";
-const selectClass = inputClass;
-const areaClass = "min-h-24 w-full rounded-lg border border-border bg-white px-4 py-3 outline-none focus:border-primary";
+const statusClass: Record<string, string> = {
+  ENTWURF: "bg-border text-text-light",
+  BEREIT_ZUR_PRUEFUNG: "bg-accent/35 text-primary-dark",
+  IN_PRUEFUNG: "bg-warning/15 text-warning",
+  FREIGEGEBEN: "bg-success/15 text-success",
+  ABGESCHLOSSEN: "bg-primary-dark/15 text-primary-dark",
+  STORNIERT: "bg-danger/15 text-danger"
+};
 
 export default function ValidationsPage() {
   const { token } = useAuth();
   const client = useQueryClient();
-  const [draftId, setDraftId] = useState<string | null>(null);
-  const [lastSaved, setLastSaved] = useState<string>("");
-  const autosaveTimer = useRef<ReturnType<typeof setTimeout> | null>(null);
-
-  const nextNumber = useQuery({ queryKey: ["next-report-number", token], queryFn: () => apiGet<{ report_number: string }>("/validations/next-report-number", token ?? ""), enabled: Boolean(token) });
-  const customers = useQuery({ queryKey: ["customers-options", token], queryFn: () => apiGet<Paginated<Customer>>("/customers?page=1&page_size=100", token ?? ""), enabled: Boolean(token) });
-  const locations = useQuery({ queryKey: ["locations-options", token], queryFn: () => apiGet<Paginated<Location>>("/locations?page=1&page_size=100", token ?? ""), enabled: Boolean(token) });
-  const contacts = useQuery({ queryKey: ["contacts-options", token], queryFn: () => apiGet<Paginated<Contact>>("/contacts?page=1&page_size=100", token ?? ""), enabled: Boolean(token) });
-  const devices = useQuery({ queryKey: ["devices-options", token], queryFn: () => apiGet<Paginated<Device>>("/devices?page=1&page_size=100", token ?? ""), enabled: Boolean(token) });
-  const equipment = useQuery({ queryKey: ["equipment-options", token], queryFn: () => apiGet<Paginated<Equipment>>("/equipment?page=1&page_size=100", token ?? ""), enabled: Boolean(token) });
-
-  const form = useForm<FormValues>({ resolver: zodResolver(schema), defaultValues: defaults() });
-  const watched = useWatch({ control: form.control });
-  const selectedDevice = devices.data?.items.find((item) => item.id === form.watch("device_id"));
-  const selectedEquipment = equipment.data?.items.filter((item) => form.watch("equipment_ids").includes(item.id)) ?? [];
-  const recommendations = useFieldArray({ control: form.control, name: "recommendations" });
-  const attachments = useFieldArray({ control: form.control, name: "attachments" });
+  const [page, setPage] = useState(1);
+  const [search, setSearch] = useState("");
+  const [status, setStatus] = useState("");
+  const [customerId, setCustomerId] = useState("");
+  const [deviceId, setDeviceId] = useState("");
+  const [validationType, setValidationType] = useState("");
+  const [result, setResult] = useState("");
+  const [dateFrom, setDateFrom] = useState("");
+  const [dateTo, setDateTo] = useState("");
+  const [overdueOnly, setOverdueOnly] = useState(false);
+  const [sorting, setSorting] = useState<SortingState>([{ id: "updated_at", desc: true }]);
+  const pageSize = 10;
+  const sort = sorting[0] ?? { id: "updated_at", desc: true };
 
   useEffect(() => {
-    if (nextNumber.data?.report_number && !form.getValues("report_number")) {
-      form.setValue("report_number", nextNumber.data.report_number);
-    }
-  }, [form, nextNumber.data]);
-
-  const saveMutation = useMutation({
-    mutationFn: (values: FormValues) => apiSend<ValidationItem>(draftId ? `/validations/${draftId}` : "/validations", token ?? "", draftId ? "PUT" : "POST", values),
-    onSuccess: (item) => {
-      setDraftId(item.id);
-      setLastSaved(new Date().toLocaleTimeString("de-DE", { hour: "2-digit", minute: "2-digit" }));
-      client.invalidateQueries({ queryKey: ["dashboard"] });
-    }
+    const initial = new URLSearchParams(window.location.search);
+    setStatus(initial.get("status") ?? "");
+    setOverdueOnly(initial.get("overdue_only") === "true");
+  }, []);
+  const params = new URLSearchParams({
+    page: String(page),
+    page_size: String(pageSize),
+    sort_by: sort.id,
+    sort_order: sort.desc ? "desc" : "asc"
   });
+  if (search) params.set("search", search);
+  if (status) params.set("status", status);
+  if (customerId) params.set("customer_id", customerId);
+  if (deviceId) params.set("device_id", deviceId);
+  if (validationType) params.set("validation_type", validationType);
+  if (result) params.set("result", result);
+  if (dateFrom) params.set("date_from", dateFrom);
+  if (dateTo) params.set("date_to", dateTo);
+  if (overdueOnly) params.set("overdue_only", "true");
 
-  useEffect(() => {
-    if (!token || !watched.report_number || !watched.customer_id || !watched.device_id || !watched.project || !watched.performed_on) return;
-    if (autosaveTimer.current) clearTimeout(autosaveTimer.current);
-    autosaveTimer.current = setTimeout(() => {
-      const values = form.getValues();
-      saveMutation.mutate(values);
-    }, 2500);
-    return () => {
-      if (autosaveTimer.current) clearTimeout(autosaveTimer.current);
-    };
-  }, [form, saveMutation, token, watched]);
+  const validations = useQuery({
+    queryKey: ["validations", params.toString(), token],
+    queryFn: () => apiGet<Paginated<ValidationItem>>(`/validations?${params.toString()}`, token ?? ""),
+    enabled: Boolean(token)
+  });
+  const customers = useQuery({ queryKey: ["customers-options", token], queryFn: () => apiGet<Paginated<Customer>>("/customers?page=1&page_size=100", token ?? ""), enabled: Boolean(token) });
+  const devices = useQuery({ queryKey: ["devices-options", token], queryFn: () => apiGet<Paginated<Device>>("/devices?page=1&page_size=100", token ?? ""), enabled: Boolean(token) });
 
-  const customerOptions = customers.data?.items ?? [];
-  const selectedCustomer = customerOptions.find((item) => item.id === form.watch("customer_id"));
-  const filteredLocations = (locations.data?.items ?? []).filter((item) => !form.watch("customer_id") || item.customer_id === form.watch("customer_id"));
-  const filteredContacts = (contacts.data?.items ?? []).filter((item) => !form.watch("customer_id") || item.customer_id === form.watch("customer_id"));
-  const filteredDevices = (devices.data?.items ?? []).filter((item) => !form.watch("customer_id") || item.customer_id === form.watch("customer_id"));
+  const duplicateMutation = useMutation({ mutationFn: (id: string) => apiSend<ValidationItem>(`/validations/${id}/duplicate`, token ?? "", "POST", {}), onSuccess: () => client.invalidateQueries({ queryKey: ["validations"] }) });
+  const versionMutation = useMutation({ mutationFn: (id: string) => apiSend<ValidationItem>(`/validations/${id}/new-version`, token ?? "", "POST", {}), onSuccess: () => client.invalidateQueries({ queryKey: ["validations"] }) });
+  const cancelMutation = useMutation({ mutationFn: (id: string) => apiSend<ValidationItem>(`/validations/${id}/cancel`, token ?? "", "POST", {}), onSuccess: () => client.invalidateQueries({ queryKey: ["validations"] }) });
+  const deleteMutation = useMutation({ mutationFn: (id: string) => apiDelete(`/validations/${id}`, token ?? ""), onSuccess: () => client.invalidateQueries({ queryKey: ["validations"] }) });
 
-  const calibrationWarnings = useMemo(() => selectedEquipment.filter((item) => item.calibration_due_on && item.calibration_due_on < today), [selectedEquipment]);
-
-  function submit(values: FormValues) {
-    saveMutation.mutate(values);
+  async function downloadPdf(id: string, reportNumber: string) {
+    const response = await fetch(`${API_BASE}/validations/${id}/report.pdf`, { headers: { Authorization: `Bearer ${token}` } });
+    const blob = await response.blob();
+    const url = URL.createObjectURL(blob);
+    const link = document.createElement("a");
+    link.href = url;
+    link.download = `${reportNumber}.pdf`;
+    link.click();
+    URL.revokeObjectURL(url);
   }
 
-  function addFiles(files: FileList | null, category: string) {
-    if (!files) return;
-    Array.from(files).forEach((file, index) => attachments.append({ category, filename: file.name, description: "", order: attachments.fields.length + index + 1, preview: URL.createObjectURL(file) }));
-  }
+  const columns = useMemo<ColumnDef<ValidationItem>[]>(() => [
+    { accessorKey: "report_number", header: "Berichtsnummer" },
+    { accessorKey: "validation_type", header: "Art" },
+    { accessorKey: "performed_on", header: "Pruefdatum" },
+    { accessorKey: "next_validation_on", header: "Naechste Validierung" },
+    { accessorKey: "examiner_name", header: "Pruefer" },
+    { accessorKey: "result", header: "Ergebnis" },
+    { accessorKey: "updated_at", header: "Zuletzt geaendert" },
+    { accessorKey: "status", header: "Status", cell: ({ row }) => <span className={`rounded-full px-3 py-1 text-xs font-semibold ${statusClass[row.original.status] ?? statusClass.ENTWURF}`}>{statusLabels[row.original.status] ?? row.original.status}</span> },
+    { id: "actions", header: "Aktionen", enableSorting: false, cell: ({ row }) => {
+      const editable = ["ENTWURF", "BEREIT_ZUR_PRUEFUNG", "IN_PRUEFUNG"].includes(row.original.status);
+      const versionable = ["FREIGEGEBEN", "ABGESCHLOSSEN"].includes(row.original.status);
+      return <div className="flex justify-end gap-2">{editable && <Link className="btn btn-secondary h-10 px-3" title="Weiterbearbeiten" href={`/validations/${row.original.id}/edit`}><Edit2 className="h-4 w-4" /> Weiterbearbeiten</Link>}{versionable && <button className="btn btn-secondary h-10 px-3" title="Neue Version erstellen" onClick={() => versionMutation.mutate(row.original.id)}><GitBranchPlus className="h-4 w-4" /> Neue Version</button>}<Link className="icon-btn" title="HTML-Vorschau" href={`/validations/${row.original.id}/preview`}><Eye className="h-4 w-4" /></Link><button className="icon-btn" title="PDF herunterladen" onClick={() => downloadPdf(row.original.id, row.original.report_number)}><Download className="h-4 w-4" /></button><button className="icon-btn" title={duplicateMutation.isPending ? "Duplizieren laeuft..." : "Duplizieren"} disabled={duplicateMutation.isPending} onClick={() => duplicateMutation.mutate(row.original.id)}>{duplicateMutation.isPending ? <span className="spinner" /> : <Copy className="h-4 w-4" />}</button><button className="icon-btn text-danger" title={cancelMutation.isPending ? "Stornieren laeuft..." : "Stornieren"} disabled={cancelMutation.isPending} onClick={() => cancelMutation.mutate(row.original.id)}>{cancelMutation.isPending ? <span className="spinner" /> : <XCircle className="h-4 w-4" />}</button>{row.original.status === "ENTWURF" && <button className="icon-btn text-danger" title={deleteMutation.isPending ? "Loeschen laeuft..." : "Loeschen"} disabled={deleteMutation.isPending} onClick={() => deleteMutation.mutate(row.original.id)}>{deleteMutation.isPending ? <span className="spinner" /> : <Trash2 className="h-4 w-4" />}</button>}</div>;
+    } }
+  ], [cancelMutation, deleteMutation, duplicateMutation, token]);
+
+  const table = useReactTable({
+    data: validations.data?.items ?? [],
+    columns,
+    state: { sorting },
+    manualSorting: true,
+    onSortingChange: setSorting,
+    getCoreRowModel: getCoreRowModel(),
+    getSortedRowModel: getSortedRowModel()
+  });
+  const totalPages = Math.max(1, Math.ceil((validations.data?.total ?? 0) / pageSize));
 
   return (
-    <form onSubmit={form.handleSubmit(submit)} className="space-y-5 pb-28">
-      <header>
-        <h1 className="text-3xl font-semibold text-text">Validierungsbericht</h1>
-        <p className="mt-2 text-text-light">Eine responsive Seite fuer Erfassung, Pruefung und Berichtserstellung.</p>
+    <div className="space-y-6">
+      <header className="flex flex-col justify-between gap-4 md:flex-row md:items-center">
+        <div><h1 className="text-3xl font-semibold">Validierungen</h1><p className="mt-2 text-text-light">Verwaltung, Vorschau, Export und Workflow.</p></div>
+        <Link href="/validations/new" className="btn btn-primary h-12"><FilePlus2 className="h-5 w-5" /> Neue Validierung</Link>
       </header>
-
-      <Accordion title="1. Allgemeine Angaben" defaultOpen>
-        <div className="grid gap-4 md:grid-cols-2">
-          <Field label="Berichtsnummer"><input className={inputClass} {...form.register("report_number")} /></Field>
-          <Field label="Validierungsart"><select className={selectClass} {...form.register("validation_type")}><option>Erstvalidierung</option><option>Revalidierung</option><option>Leistungsbeurteilung</option><option>Sonderpruefung</option></select></Field>
-          <Field label="Projekt"><input className={inputClass} {...form.register("project")} /></Field>
-          <Field label="Pruefdatum"><input type="date" className={inputClass} {...form.register("performed_on")} /></Field>
-          <Field label="Pruefungsort"><input className={inputClass} {...form.register("test_location")} /></Field>
-          <Field label="Pruefer"><input className={inputClass} {...form.register("examiner_name")} /></Field>
-          <Field label="Mitwirkende Personen"><textarea className={areaClass} {...form.register("participants")} /></Field>
-          <Field label="Status"><select className={selectClass} {...form.register("status")}><option value="draft">Entwurf</option><option value="in_progress">In Pruefung</option><option value="ready_for_report">Bericht bereit</option><option value="completed">Abgeschlossen</option></select></Field>
-          <Field label="Gesamtergebnis"><select className={selectClass} {...form.register("result")}><option value="offen">Offen</option><option value="bestanden">Bestanden</option><option value="nicht_bestanden">Nicht bestanden</option><option value="mit_auflagen">Mit Auflagen</option></select></Field>
+      <section className="rounded-lg border border-border bg-surface p-4 shadow-soft">
+        <div className="grid gap-3 md:grid-cols-4">
+          <label className="flex h-12 items-center gap-2 rounded-lg border border-border px-3 md:col-span-2"><Search className="h-4 w-4 text-primary" /><input value={search} onChange={(event) => { setPage(1); setSearch(event.target.value); }} className="flex-1 outline-none" placeholder="Volltextsuche" /></label>
+          <select value={status} onChange={(event) => setStatus(event.target.value)} className="h-12 rounded-lg border border-border px-3"><option value="">Alle Status</option>{Object.entries(statusLabels).map(([value, label]) => <option key={value} value={value}>{label}</option>)}</select>
+          <select value={validationType} onChange={(event) => setValidationType(event.target.value)} className="h-12 rounded-lg border border-border px-3"><option value="">Alle Arten</option><option>Erstvalidierung</option><option>Revalidierung</option><option>Leistungsbeurteilung</option><option>Sonderpruefung</option></select>
+          <select value={customerId} onChange={(event) => setCustomerId(event.target.value)} className="h-12 rounded-lg border border-border px-3"><option value="">Alle Kunden</option>{(customers.data?.items ?? []).map((item) => <option key={item.id} value={item.id}>{item.name}</option>)}</select>
+          <select value={deviceId} onChange={(event) => setDeviceId(event.target.value)} className="h-12 rounded-lg border border-border px-3"><option value="">Alle Geraete</option>{(devices.data?.items ?? []).map((item) => <option key={item.id} value={item.id}>{item.manufacturer} {item.model}</option>)}</select>
+          <select value={result} onChange={(event) => setResult(event.target.value)} className="h-12 rounded-lg border border-border px-3"><option value="">Alle Ergebnisse</option><option value="offen">Offen</option><option value="bestanden">Bestanden</option><option value="nicht_bestanden">Nicht bestanden</option><option value="mit_auflagen">Mit Auflagen</option></select>
+          <input type="date" value={dateFrom} onChange={(event) => setDateFrom(event.target.value)} className="h-12 rounded-lg border border-border px-3" />
+          <input type="date" value={dateTo} onChange={(event) => setDateTo(event.target.value)} className="h-12 rounded-lg border border-border px-3" />
+          <label className="flex h-12 items-center gap-3 rounded-lg border border-border px-3"><input type="checkbox" checked={overdueOnly} onChange={(event) => setOverdueOnly(event.target.checked)} /> ueberfaellige Revalidierungen</label>
         </div>
-      </Accordion>
-
-      <Accordion title="2. Kunde und Standort">
-        <div className="grid gap-4 md:grid-cols-2">
-          <Field label="Kunde"><select className={selectClass} {...form.register("customer_id")}><option value="">Bitte waehlen</option>{customerOptions.map((item) => <option key={item.id} value={item.id}>{item.name}</option>)}</select></Field>
-          <Field label="Standort"><select className={selectClass} {...form.register("location_id")}><option value="">Bitte waehlen</option>{filteredLocations.map((item) => <option key={item.id} value={item.id}>{item.name}</option>)}</select></Field>
-          <Field label="Ansprechpartner"><select className={selectClass} {...form.register("contact_id")}><option value="">Bitte waehlen</option>{filteredContacts.map((item) => <option key={item.id} value={item.id}>{item.full_name}</option>)}</select></Field>
-          <Field label="Betreiber"><input className={inputClass} {...form.register("operator_name")} /></Field>
-          <Field label="QM-/Hygienebeauftragter"><input className={inputClass} value={[selectedCustomer?.quality_manager, selectedCustomer?.hygiene_officer].filter(Boolean).join(" / ")} readOnly /></Field>
+      </section>
+      <ImportPanel />
+      <section className="overflow-hidden rounded-lg border border-border bg-surface shadow-soft">
+        <div className="overflow-x-auto">
+          <table className="min-w-full text-left text-sm">
+            <thead className="bg-background text-xs uppercase text-text-light">{table.getHeaderGroups().map((group) => <tr key={group.id}>{group.headers.map((header) => <th key={header.id} onClick={header.column.getToggleSortingHandler()} className="cursor-pointer px-5 py-4 hover:text-primary-dark">{flexRender(header.column.columnDef.header, header.getContext())}</th>)}</tr>)}</thead>
+            <tbody className="divide-y divide-border">{table.getRowModel().rows.map((row) => <tr key={row.id} className="hover:bg-accent/10">{row.getVisibleCells().map((cell) => <td key={cell.id} className="whitespace-nowrap px-5 py-4">{flexRender(cell.column.columnDef.cell, cell.getContext())}</td>)}</tr>)}</tbody>
+          </table>
         </div>
-      </Accordion>
-
-      <Accordion title="3. Geraet">
-        <Field label="Geraet"><select className={selectClass} {...form.register("device_id")}><option value="">Bitte waehlen</option>{filteredDevices.map((item) => <option key={item.id} value={item.id}>{item.manufacturer} {item.model} - {item.serial_number}</option>)}</select></Field>
-        <div className="mt-4 grid gap-4 md:grid-cols-3">{[
-          ["Hersteller", selectedDevice?.manufacturer],
-          ["Modell", selectedDevice?.model],
-          ["Seriennummer", selectedDevice?.serial_number],
-          ["Baujahr", selectedDevice?.year_built],
-          ["Inbetriebnahme", selectedDevice?.commissioned_on],
-          ["Kammervolumen", selectedDevice?.chamber_volume_liters],
-          ["Dampferzeugung", selectedDevice?.steam_generation],
-          ["Wasseraufbereitung", selectedDevice?.water_treatment],
-          ["Dokumentation", selectedDevice?.documentation],
-          ["Lieferant", selectedDevice?.supplier]
-        ].map(([label, value]) => <div key={label as string} className="rounded-lg border border-border bg-background p-4"><p className="text-xs text-text-light">{label}</p><p className="mt-1 font-medium">{String(value ?? "-")}</p></div>)}</div>
-      </Accordion>
-
-      <Accordion title="4. Pruefmittel">
-        <Controller control={form.control} name="equipment_ids" render={({ field }) => (
-          <div className="grid gap-3 md:grid-cols-2">
-            {(equipment.data?.items ?? []).map((item) => {
-              const expired = Boolean(item.calibration_due_on && item.calibration_due_on < today);
-              return <label key={item.id} className="flex items-start gap-3 rounded-lg border border-border p-4"><input type="checkbox" className="mt-1 h-5 w-5" checked={field.value.includes(item.id)} onChange={(event) => field.onChange(event.target.checked ? [...field.value, item.id] : field.value.filter((id: string) => id !== item.id))} /><span><strong>{item.kind}</strong><br />{item.serial_number} · {item.calibrated_on ?? "-"} · {item.status}{expired && <span className="ml-2 text-danger">Kalibrierung abgelaufen</span>}</span></label>;
-            })}
-          </div>
-        )} />
-        {calibrationWarnings.length > 0 && <p className="mt-4 rounded-lg border border-danger/30 bg-danger/5 p-4 text-danger">Mindestens ein ausgewaehltes Pruefmittel hat eine abgelaufene Kalibrierung.</p>}
-      </Accordion>
-
-      <Accordion title="5. Umgebungsbedingungen">
-        <div className="grid gap-4 md:grid-cols-3">
-          <Field label="Raumtemperatur"><input className={inputClass} {...form.register("environment_conditions.room_temperature")} /></Field>
-          <Field label="relative Luftfeuchtigkeit"><input className={inputClass} {...form.register("environment_conditions.humidity")} /></Field>
-          <Field label="Pruefzeit"><input className={inputClass} {...form.register("environment_conditions.test_time")} /></Field>
-        </div>
-        {[0, 1, 2].map((index) => <ChecklistRow key={index} form={form} path={`environment_conditions.checks.${index}`} />)}
-      </Accordion>
-
-      <Accordion title="6. Dokumentations- und Leistungschecklisten">
-        <h3 className="font-semibold">Dokumentation</h3>{checklistTexts.map((_, index) => <ChecklistRow key={index} form={form} path={`documentation_checklist.${index}`} />)}
-        <h3 className="mt-6 font-semibold">Leistung</h3>{performanceTexts.map((_, index) => <ChecklistRow key={index} form={form} path={`performance_checklist.${index}`} />)}
-      </Accordion>
-
-      <Accordion title="7. Programme">
-        {[0, 1, 2].map((index) => <ProgramRow key={index} form={form} index={index} />)}
-        <button type="button" onClick={() => form.setValue("programs", [...form.getValues("programs"), { name: "", selected: true, custom: true }])} className="mt-4 inline-flex items-center gap-2 rounded-lg border border-border px-4 py-3 font-semibold"><Plus className="h-4 w-4" /> Eigenes Programm</button>
-      </Accordion>
-
-      <Accordion title="8. Beladungsmuster">
-        {[0, 1, 2].map((index) => <LoadingRun key={index} form={form} index={index} />)}
-      </Accordion>
-
-      <Accordion title="9. Messdaten">
-        {[0, 1, 2, 3, 4].map((index) => <MeasurementBlock key={index} form={form} index={index} />)}
-      </Accordion>
-
-      <Accordion title="10. Trocknung">
-        <div className="grid gap-4 md:grid-cols-2">
-          {["start_weight", "end_weight", "difference", "rating"].map((name) => <Field key={name} label={name}><input className={inputClass} {...form.register(`drying.${name}`)} /></Field>)}
-          <Field label="Bemerkung"><textarea className={areaClass} {...form.register("drying.comment")} /></Field>
-        </div>
-      </Accordion>
-
-      <Accordion title="11. Empfehlungen und Auflagen">
-        {recommendations.fields.map((field, index) => <div key={field.id} className="mb-3 grid gap-3 rounded-lg border border-border p-4 md:grid-cols-4"><input className={inputClass} placeholder="Nummer" {...form.register(`recommendations.${index}.number`)} /><input className={inputClass} placeholder="Text" {...form.register(`recommendations.${index}.text`)} /><input type="date" className={inputClass} {...form.register(`recommendations.${index}.deadline`)} /><input className={inputClass} placeholder="Status" {...form.register(`recommendations.${index}.status`)} /></div>)}
-        <button type="button" onClick={() => recommendations.append({ number: recommendations.fields.length + 1, text: "", deadline: "", status: "offen" })} className="inline-flex items-center gap-2 rounded-lg border border-border px-4 py-3 font-semibold"><Plus className="h-4 w-4" /> Zeile hinzufuegen</button>
-      </Accordion>
-
-      <Accordion title="12. Bilder und Anlagen">
-        <div className="grid gap-3 md:grid-cols-2">{attachmentCategories.map((category) => <label key={category} className="rounded-lg border border-dashed border-primary/40 p-4"><UploadCloud className="mb-2 h-5 w-5 text-primary" />{category}<input type="file" multiple className="mt-3 block w-full text-sm" onChange={(event) => addFiles(event.target.files, category)} /></label>)}</div>
-        <div className="mt-5 grid gap-3 md:grid-cols-2">{attachments.fields.map((field, index) => <div key={field.id} className="rounded-lg border border-border p-4"><div className="flex justify-between gap-3"><strong>{String(form.watch(`attachments.${index}.filename`) ?? "")}</strong><button type="button" onClick={() => attachments.remove(index)}><X className="h-4 w-4 text-danger" /></button></div><input className={`${inputClass} mt-3`} placeholder="Beschreibung" {...form.register(`attachments.${index}.description`)} /><input className={`${inputClass} mt-3`} placeholder="Reihenfolge" {...form.register(`attachments.${index}.order`)} /></div>)}</div>
-      </Accordion>
-
-      <div className="fixed inset-x-0 bottom-0 z-40 border-t border-border bg-surface/95 px-4 py-3 shadow-soft backdrop-blur">
-        <div className="mx-auto flex max-w-7xl flex-wrap items-center justify-between gap-3">
-          <span className="text-sm text-text-light">{lastSaved ? `Automatisch gespeichert um ${lastSaved}` : "Autosave aktiv, sobald Pflichtfelder ausgefuellt sind."}</span>
-          <div className="flex flex-wrap gap-2">
-            <button type="submit" className="inline-flex h-12 items-center gap-2 rounded-lg border border-border px-4 font-semibold"><Save className="h-4 w-4" /> Entwurf speichern</button>
-            <button type="button" onClick={() => form.setValue("status", "ready_for_report")} className="inline-flex h-12 items-center gap-2 rounded-lg border border-border px-4 font-semibold"><ShieldCheck className="h-4 w-4" /> Validierung pruefen</button>
-            <button type="button" className="inline-flex h-12 items-center gap-2 rounded-lg bg-primary px-4 font-semibold text-white shadow-soft"><FileText className="h-4 w-4" /> Bericht erzeugen</button>
-            <button type="button" className="inline-flex h-12 items-center gap-2 rounded-lg border border-border px-4 font-semibold"><Download className="h-4 w-4" /> Bericht herunterladen</button>
-          </div>
-        </div>
-      </div>
-    </form>
+      </section>
+      <footer className="flex items-center justify-between text-sm text-text-light"><span>{validations.data?.total ?? 0} Datensaetze</span><div className="flex items-center gap-3"><button disabled={page <= 1} title={page <= 1 ? "Erste Seite erreicht" : undefined} onClick={() => setPage((value) => value - 1)} className="btn btn-secondary">Zurueck</button><span>Seite {page} von {totalPages}</span><button disabled={page >= totalPages} title={page >= totalPages ? "Letzte Seite erreicht" : undefined} onClick={() => setPage((value) => value + 1)} className="btn btn-secondary">Weiter</button></div></footer>
+    </div>
   );
 }
 
-function ChecklistRow({ form, path }: { form: ReturnType<typeof useForm<FormValues>>; path: string }) {
-  return <div className="mt-3 grid gap-3 rounded-lg border border-border p-4 md:grid-cols-[1fr_180px_1fr]"><input className={inputClass} readOnly {...form.register(`${path}.text` as never)} /><select className={selectClass} {...form.register(`${path}.value` as never)}>{triState.map((value) => <option key={value} value={value}>{value === "yes" ? "Ja" : value === "no" ? "Nein" : "Nicht zutreffend"}</option>)}</select><input className={inputClass} placeholder="Kommentar" {...form.register(`${path}.comment` as never)} /></div>;
-}
+type ImportPreview = {
+  rows: { row_number: number; data: Record<string, string>; errors: string[]; duplicate: boolean }[];
+  valid_rows: number;
+  invalid_rows: number;
+  duplicates: number;
+};
 
-function ProgramRow({ form, index }: { form: ReturnType<typeof useForm<FormValues>>; index: number }) {
-  return <div className="mb-3 grid gap-3 rounded-lg border border-border p-4 md:grid-cols-[80px_1fr]"><input type="checkbox" className="h-6 w-6" {...form.register(`programs.${index}.selected`)} /><input className={inputClass} {...form.register(`programs.${index}.name`)} /></div>;
-}
+function ImportPanel() {
+  const { token } = useAuth();
+  const client = useQueryClient();
+  const [preview, setPreview] = useState<ImportPreview | null>(null);
+  const [summary, setSummary] = useState("");
+  const [strategy, setStrategy] = useState("skip");
 
-function LoadingRun({ form, index }: { form: ReturnType<typeof useForm<FormValues>>; index: number }) {
-  return <div className="mb-4 rounded-lg border border-border p-4"><h3 className="font-semibold">Testlauf {index + 1}</h3><div className="mt-3 grid gap-3 md:grid-cols-2"><input className={inputClass} placeholder="Beladungsmuster" {...form.register(`loading_patterns.${index}.pattern`)} /><input className={inputClass} placeholder="Beschreibung" {...form.register(`loading_patterns.${index}.description`)} /><input type="file" multiple className="rounded-lg border border-border p-3 md:col-span-2" /></div></div>;
-}
+  async function previewCsv(file: File | null) {
+    if (!file || !token) return;
+    const formData = new FormData();
+    formData.append("file", file);
+    const response = await fetch(`${API_BASE}/validations/import/csv-preview`, {
+      method: "POST",
+      headers: { Authorization: `Bearer ${token}` },
+      body: formData
+    });
+    setPreview(await response.json());
+  }
 
-function MeasurementBlock({ form, index }: { form: ReturnType<typeof useForm<FormValues>>; index: number }) {
-  const fields = ["start_time", "end_time", "duration", "leak_rate", "min_temperature", "max_temperature", "temperature_band", "equilibration_time", "holding_time", "pressure", "result"];
-  return <div className="mb-4 rounded-lg border border-border p-4"><h3 className="font-semibold">{String(form.watch(`measurement_data.${index}.name`) ?? "")}</h3><div className="mt-3 grid gap-3 md:grid-cols-3">{fields.map((field) => <input key={field} className={inputClass} placeholder={field} {...form.register(`measurement_data.${index}.${field}`)} />)}<input type="file" multiple accept=".csv,.pdf" className="rounded-lg border border-border p-3 md:col-span-3" /></div></div>;
+  async function importJson(file: File | null) {
+    if (!file || !token) return;
+    const parsed = JSON.parse(await file.text());
+    const rows = Array.isArray(parsed) ? parsed : [parsed];
+    const response = await fetch(`${API_BASE}/validations/import/json`, {
+      method: "POST",
+      headers: { Authorization: `Bearer ${token}`, "Content-Type": "application/json" },
+      body: JSON.stringify({ rows, duplicate_strategy: strategy })
+    });
+    const result = await response.json();
+    setSummary(`Erfolgreich: ${result.successful}, uebersprungen: ${result.skipped}, fehlerhaft: ${result.failed}`);
+    client.invalidateQueries({ queryKey: ["validations"] });
+  }
+
+  return (
+    <section className="rounded-lg border border-border bg-surface p-4 shadow-soft">
+      <div className="flex flex-col gap-3 md:flex-row md:items-center md:justify-between">
+        <div><h2 className="font-semibold">Import</h2><p className="mt-1 text-sm text-text-light">CSV-Vorschau und JSON-Import mit Duplikatstrategie.</p></div>
+        <select value={strategy} onChange={(event) => setStrategy(event.target.value)} className="h-11 rounded-lg border border-border px-3"><option value="skip">Duplikate ueberspringen</option><option value="update">Duplikate aktualisieren</option><option value="copy">Als Kopie importieren</option></select>
+      </div>
+      <div className="mt-4 grid gap-3 md:grid-cols-2">
+        <label className="rounded-lg border border-dashed border-primary/40 p-4 transition hover:border-primary hover:bg-accent/10 hover:shadow-soft">CSV-Vorschau<input type="file" accept=".csv" className="mt-3 block w-full cursor-pointer" onChange={(event) => previewCsv(event.target.files?.[0] ?? null)} /></label>
+        <label className="rounded-lg border border-dashed border-primary/40 p-4 transition hover:border-primary hover:bg-accent/10 hover:shadow-soft">JSON importieren<input type="file" accept=".json" className="mt-3 block w-full cursor-pointer" onChange={(event) => importJson(event.target.files?.[0] ?? null)} /></label>
+      </div>
+      {summary && <p className="mt-3 text-sm text-primary-dark">{summary}</p>}
+      {preview && <div className="mt-4 overflow-x-auto"><p className="mb-2 text-sm text-text-light">Gueltig: {preview.valid_rows}, fehlerhaft: {preview.invalid_rows}, Duplikate: {preview.duplicates}</p><table className="min-w-full text-left text-sm"><thead className="bg-background text-xs uppercase text-text-light"><tr><th className="px-3 py-2">Zeile</th><th className="px-3 py-2">Berichtsnummer</th><th className="px-3 py-2">Status</th><th className="px-3 py-2">Fehler</th></tr></thead><tbody>{preview.rows.map((row) => <tr key={row.row_number} className="border-t border-border"><td className="px-3 py-2">{row.row_number}</td><td className="px-3 py-2">{row.data.report_number}</td><td className="px-3 py-2">{row.duplicate ? "Duplikat" : "Neu"}</td><td className="px-3 py-2 text-danger">{row.errors.join(", ")}</td></tr>)}</tbody></table></div>}
+    </section>
+  );
 }
diff --git a/validation-suite/frontend/atlas/app/globals.css b/validation-suite/frontend/atlas/app/globals.css
index 488091cb..05f145c3 100644
--- a/validation-suite/frontend/atlas/app/globals.css
+++ b/validation-suite/frontend/atlas/app/globals.css
@@ -25,3 +25,158 @@ textarea {
   font: inherit;
 }
 
+button,
+a {
+  transition:
+    background-color 180ms ease,
+    border-color 180ms ease,
+    box-shadow 180ms ease,
+    color 180ms ease,
+    opacity 180ms ease,
+    transform 180ms ease;
+}
+
+button {
+  cursor: pointer;
+}
+
+button:hover:not(:disabled) {
+  box-shadow: 0 12px 28px rgba(46, 59, 64, 0.12);
+  transform: translateY(-1px);
+}
+
+button:hover:not(:disabled) svg,
+a:hover svg,
+label:hover svg {
+  transform: scale(1.08);
+}
+
+button:active:not(:disabled),
+a:active {
+  transform: scale(0.98);
+}
+
+button:disabled,
+[aria-disabled="true"] {
+  cursor: not-allowed;
+  opacity: 0.45;
+}
+
+a:hover {
+  text-decoration: underline;
+  text-underline-offset: 4px;
+}
+
+svg {
+  transition: transform 180ms ease, color 180ms ease;
+}
+
+input,
+select,
+textarea {
+  transition: border-color 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
+}
+
+input:focus,
+select:focus,
+textarea:focus {
+  border-color: #6C8A96;
+  box-shadow: 0 0 0 3px rgba(108, 138, 150, 0.18);
+  outline: none;
+}
+
+tbody tr {
+  transition: background-color 180ms ease;
+}
+
+tbody tr:hover {
+  background: rgba(167, 199, 199, 0.14);
+}
+
+.btn {
+  align-items: center;
+  border: 1px solid #E6EAEA;
+  border-radius: 8px;
+  display: inline-flex;
+  font-weight: 700;
+  gap: 8px;
+  justify-content: center;
+  min-height: 44px;
+  padding: 10px 16px;
+}
+
+.btn-secondary {
+  background: #FFFFFF;
+  color: #2E3B40;
+}
+
+.btn-secondary:hover:not(:disabled) {
+  background: #F7F8F8;
+  border-color: #A7C7C7;
+}
+
+.btn-secondary:active:not(:disabled) {
+  background: #E6EAEA;
+}
+
+.btn-primary {
+  background: #6C8A96;
+  border-color: #6C8A96;
+  color: #FFFFFF;
+}
+
+.btn-primary:hover:not(:disabled) {
+  background: #4F6A74;
+}
+
+.btn-primary:active:not(:disabled) {
+  background: #415B64;
+}
+
+.btn-danger {
+  background: #FFFFFF;
+  border-color: rgba(201, 92, 84, 0.35);
+  color: #C95C54;
+}
+
+.btn-danger:hover:not(:disabled) {
+  background: rgba(201, 92, 84, 0.08);
+  border-color: #C95C54;
+}
+
+.btn-success {
+  background: rgba(102, 162, 107, 0.12);
+  border-color: rgba(102, 162, 107, 0.35);
+  color: #427646;
+}
+
+.icon-btn {
+  align-items: center;
+  background: #FFFFFF;
+  border: 1px solid #E6EAEA;
+  border-radius: 8px;
+  display: inline-flex;
+  height: 38px;
+  justify-content: center;
+  width: 38px;
+}
+
+.icon-btn:hover:not(:disabled) {
+  background: #F7F8F8;
+  border-color: #A7C7C7;
+}
+
+.spinner {
+  animation: spin 0.8s linear infinite;
+  border: 2px solid currentColor;
+  border-right-color: transparent;
+  border-radius: 999px;
+  height: 16px;
+  width: 16px;
+}
+
+@keyframes spin {
+  to {
+    transform: rotate(360deg);
+  }
+}
diff --git a/validation-suite/frontend/atlas/components/action-button.tsx b/validation-suite/frontend/atlas/components/action-button.tsx
new file mode 100644
index 00000000..38fee937
--- /dev/null
+++ b/validation-suite/frontend/atlas/components/action-button.tsx
@@ -0,0 +1,39 @@
+"use client";
+
+import { Check } from "lucide-react";
+
+export type ActionState = "normal" | "loading" | "success" | "error";
+
+export function ActionButton({
+  children,
+  icon,
+  state = "normal",
+  loadingText,
+  successText = "Gespeichert",
+  disabled,
+  disabledReason,
+  variant = "secondary",
+  className = "",
+  ...props
+}: React.ButtonHTMLAttributes<HTMLButtonElement> & {
+  icon?: React.ReactNode;
+  state?: ActionState;
+  loadingText?: string;
+  successText?: string;
+  disabledReason?: string;
+  variant?: "primary" | "secondary" | "danger" | "success";
+}) {
+  const isDisabled = disabled || state === "loading";
+  const variantClass = state === "success" ? "btn-success" : state === "error" ? "btn-danger" : `btn-${variant}`;
+  return (
+    <button
+      {...props}
+      disabled={isDisabled}
+      title={isDisabled ? disabledReason : props.title}
+      className={`btn ${variantClass} ${className}`}
+    >
+      {state === "loading" ? <span className="spinner" /> : state === "success" ? <Check className="h-4 w-4" /> : icon}
+      <span>{state === "loading" ? loadingText ?? "Laedt..." : state === "success" ? successText : children}</span>
+    </button>
+  );
+}
diff --git a/validation-suite/frontend/atlas/components/app-shell.tsx b/validation-suite/frontend/atlas/components/app-shell.tsx
index 2208c44a..5f85244a 100644
--- a/validation-suite/frontend/atlas/components/app-shell.tsx
+++ b/validation-suite/frontend/atlas/components/app-shell.tsx
@@ -45,7 +45,7 @@ export function AppShell({ children }: { children: React.ReactNode }) {
               <Link
                 key={`${item.label}-${index}`}
                 href={item.href}
-                className={`flex h-11 items-center gap-3 rounded-lg px-3 text-sm font-medium transition ${
+                className={`flex h-11 items-center gap-3 rounded-lg px-3 text-sm font-medium transition hover:shadow-soft active:scale-[0.98] ${
                   active ? "bg-accent/35 text-primary-dark" : "text-text-light hover:bg-background hover:text-text"
                 }`}
               >
@@ -58,7 +58,7 @@ export function AppShell({ children }: { children: React.ReactNode }) {
         <button
           type="button"
           onClick={auth.logout}
-          className="absolute bottom-6 left-5 right-5 flex h-11 items-center justify-center gap-2 rounded-lg bg-primary px-4 text-sm font-semibold text-white shadow-soft"
+          className="btn btn-primary absolute bottom-6 left-5 right-5 h-11 text-sm"
         >
           <LogOut className="h-4 w-4" />
           Logout
diff --git a/validation-suite/frontend/atlas/components/crud-page.tsx b/validation-suite/frontend/atlas/components/crud-page.tsx
index 4e07ad5e..fcd2c61b 100644
--- a/validation-suite/frontend/atlas/components/crud-page.tsx
+++ b/validation-suite/frontend/atlas/components/crud-page.tsx
@@ -103,7 +103,7 @@ export function CrudPage<T extends Entity>({
           <h1 className="text-3xl font-semibold text-text">{title}</h1>
           <p className="mt-2 text-text-light">{subtitle}</p>
         </div>
-        <button onClick={startCreate} className="h-12 rounded-lg bg-primary px-5 font-semibold text-white shadow-soft">Neu</button>
+        <button onClick={startCreate} className="btn btn-primary h-12">Neu</button>
       </header>
 
       <div className="flex items-center gap-3 rounded-lg border border-border bg-surface px-4 py-3 shadow-soft">
@@ -130,12 +130,12 @@ export function CrudPage<T extends Entity>({
             </thead>
             <tbody className="divide-y divide-border">
               {rows.map((item) => (
-                <tr key={item.id}>
+                <tr key={item.id} className="hover:bg-accent/10">
                   {columns.map((column) => <td key={String(column.key)} className="whitespace-nowrap px-5 py-4">{valueForInput(item[column.key])}</td>)}
                   <td className="px-5 py-4">
                     <div className="flex justify-end gap-2">
-                      <button aria-label="Bearbeiten" onClick={() => startEdit(item)} className="rounded-lg border border-border p-2 text-primary-dark"><Edit2 className="h-4 w-4" /></button>
-                      <button aria-label="Loeschen" onClick={() => deleteMutation.mutate(item)} className="rounded-lg border border-border p-2 text-danger"><Trash2 className="h-4 w-4" /></button>
+                      <button aria-label="Bearbeiten" title="Bearbeiten" onClick={() => startEdit(item)} className="icon-btn text-primary-dark"><Edit2 className="h-4 w-4" /></button>
+                      <button aria-label="Loeschen" title={deleteMutation.isPending ? "Loeschen laeuft..." : "Loeschen"} disabled={deleteMutation.isPending} onClick={() => deleteMutation.mutate(item)} className="icon-btn text-danger">{deleteMutation.isPending ? <span className="spinner" /> : <Trash2 className="h-4 w-4" />}</button>
                     </div>
                   </td>
                 </tr>
@@ -151,9 +151,9 @@ export function CrudPage<T extends Entity>({
       <footer className="flex items-center justify-between text-sm text-text-light">
         <span>{query.data?.total ?? 0} Datensaetze</span>
         <div className="flex items-center gap-3">
-          <button disabled={page <= 1} onClick={() => setPage((value) => value - 1)} className="rounded-lg border border-border px-4 py-2 disabled:opacity-40">Zurueck</button>
+          <button disabled={page <= 1} title={page <= 1 ? "Erste Seite erreicht" : undefined} onClick={() => setPage((value) => value - 1)} className="btn btn-secondary">Zurueck</button>
           <span>Seite {page} von {totalPages}</span>
-          <button disabled={page >= totalPages} onClick={() => setPage((value) => value + 1)} className="rounded-lg border border-border px-4 py-2 disabled:opacity-40">Weiter</button>
+          <button disabled={page >= totalPages} title={page >= totalPages ? "Letzte Seite erreicht" : undefined} onClick={() => setPage((value) => value + 1)} className="btn btn-secondary">Weiter</button>
         </div>
       </footer>
 
@@ -162,7 +162,7 @@ export function CrudPage<T extends Entity>({
           <form onSubmit={form.handleSubmit((values) => saveMutation.mutate(values))} className="max-h-[92vh] w-full max-w-3xl overflow-y-auto rounded-lg bg-surface p-6 shadow-soft">
             <div className="mb-5 flex items-center justify-between">
               <h2 className="text-xl font-semibold">{editing ? "Bearbeiten" : "Neu"}</h2>
-              <button type="button" onClick={() => setOpen(false)} className="rounded-lg border border-border p-2"><X className="h-4 w-4" /></button>
+              <button type="button" onClick={() => setOpen(false)} className="icon-btn"><X className="h-4 w-4" /></button>
             </div>
             <div className="grid gap-4 sm:grid-cols-2">
               {fields.map((field) => (
@@ -184,8 +184,8 @@ export function CrudPage<T extends Entity>({
             </div>
             {saveMutation.isError && <p className="mt-4 text-sm text-danger">Speichern fehlgeschlagen. Bitte Eingaben pruefen.</p>}
             <div className="mt-6 flex justify-end gap-3">
-              <button type="button" onClick={() => setOpen(false)} className="rounded-lg border border-border px-5 py-3 font-semibold">Abbrechen</button>
-              <button type="submit" className="rounded-lg bg-primary px-5 py-3 font-semibold text-white shadow-soft">Speichern</button>
+              <button type="button" onClick={() => setOpen(false)} className="btn btn-secondary">Abbrechen</button>
+              <button type="submit" disabled={saveMutation.isPending} title={saveMutation.isPending ? "Speichern laeuft..." : undefined} className="btn btn-primary">{saveMutation.isPending ? <span className="spinner" /> : null}{saveMutation.isPending ? "Speichern..." : "Speichern"}</button>
             </div>
           </form>
         </div>
diff --git a/validation-suite/frontend/atlas/components/validations/validation-editor.tsx b/validation-suite/frontend/atlas/components/validations/validation-editor.tsx
new file mode 100644
index 00000000..8d045315
--- /dev/null
+++ b/validation-suite/frontend/atlas/components/validations/validation-editor.tsx
@@ -0,0 +1,515 @@
+"use client";
+
+import { zodResolver } from "@hookform/resolvers/zod";
+import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
+import { ChevronDown, Download, FileText, Plus, Save, ShieldCheck, UploadCloud, X } from "lucide-react";
+import { useEffect, useMemo, useRef, useState } from "react";
+import { Controller, useFieldArray, useForm, useWatch } from "react-hook-form";
+import { z } from "zod";
+import { ActionButton, ActionState } from "@/components/action-button";
+import { useAuth } from "@/components/auth";
+import { API_BASE, apiGet, apiSend, Contact, Customer, Device, Equipment, Location, normalizeValidationPayload, Paginated, ValidationItem } from "@/lib/api";
+
+const triState = ["yes", "no", "na"] as const;
+const today = new Date().toISOString().slice(0, 10);
+
+const checklistTexts = [
+  "Gebrauchsanweisung und Herstellerdokumentation vorhanden",
+  "Wartungsnachweise vollstaendig",
+  "Kalibrierzertifikate der Pruefmittel gueltig",
+  "Aufstellbedingungen dokumentiert",
+  "Wasserqualitaet dokumentiert",
+  "Chargendokumentation nachvollziehbar",
+  "Routinekontrollen definiert",
+  "Freigabeverfahren beschrieben",
+  "Personal eingewiesen",
+  "Abweichungen bewertet"
+];
+
+const performanceTexts = [
+  "Vakuumtest entspricht Vorgaben",
+  "Bowie-Dick / Leerkammerprofil entspricht Vorgaben",
+  "Temperaturband innerhalb Spezifikation",
+  "Haltezeit erreicht",
+  "Druckverlauf plausibel",
+  "Trocknungsergebnis akzeptabel",
+  "Beladungsmuster reproduzierbar",
+  "Sensorpositionen dokumentiert"
+];
+
+const attachmentCategories = [
+  "Aufbereitungsraum",
+  "reiner Bereich",
+  "unreiner Bereich",
+  "Sterilisator",
+  "Beladung",
+  "Sensorposition",
+  "Chargenprotokoll",
+  "Indikator",
+  "Zertifikat",
+  "Kalibrierschein",
+  "Winlog-Auswertung"
+];
+
+const requiredLabels: Record<string, { label: string; section: string }> = {
+  report_number: { label: "Berichtsnummer", section: "Allgemeine Angaben" },
+  validation_type: { label: "Validierungsart", section: "Allgemeine Angaben" },
+  performed_on: { label: "Pruefdatum", section: "Allgemeine Angaben" },
+  customer_id: { label: "Kunde", section: "Kunde und Standort" },
+  location_id: { label: "Standort", section: "Kunde und Standort" },
+  device_id: { label: "Geraet", section: "Geraet" },
+  examiner_name: { label: "Pruefer", section: "Allgemeine Angaben" }
+};
+
+const schema = z.object({
+  report_number: z.string().min(3),
+  validation_type: z.string().min(1),
+  project: z.string().optional(),
+  performed_on: z.string().min(1),
+  next_validation_on: z.string().optional().nullable(),
+  revalidation_interval_months: z.coerce.number().int().min(1),
+  next_validation_manually_overridden: z.boolean(),
+  test_location: z.string().optional(),
+  examiner_name: z.string().min(1),
+  participants: z.string().optional(),
+  status: z.string().min(1),
+  result: z.string().min(1),
+  customer_id: z.string().min(1),
+  location_id: z.string().min(1),
+  contact_id: z.string().optional().nullable(),
+  examiner_id: z.string().optional().nullable(),
+  operator_name: z.string().optional(),
+  device_id: z.string().min(1),
+  equipment_ids: z.array(z.string()),
+  environment_conditions: z.record(z.unknown()),
+  documentation_checklist: z.array(z.record(z.unknown())),
+  performance_checklist: z.array(z.record(z.unknown())),
+  programs: z.array(z.record(z.unknown())),
+  loading_patterns: z.array(z.record(z.unknown())),
+  measurement_data: z.array(z.record(z.unknown())),
+  drying: z.record(z.unknown()),
+  recommendations: z.array(z.record(z.unknown())),
+  attachments: z.array(z.record(z.unknown()))
+});
+
+type FormValues = z.infer<typeof schema>;
+type ReviewIssue = { field: string; message: string; section: string };
+type ReviewResult = { status: string; errors: ReviewIssue[]; warnings: ReviewIssue[]; complete_sections: string[] };
+
+function checklist(items: string[]) {
+  return items.map((text, index) => ({ number: index + 1, text, value: "na", comment: "" }));
+}
+
+function defaults(reportNumber = ""): FormValues {
+  return {
+    report_number: reportNumber,
+    validation_type: "Erstvalidierung",
+    project: "",
+    performed_on: today,
+    next_validation_on: "",
+    revalidation_interval_months: 24,
+    next_validation_manually_overridden: false,
+    test_location: "",
+    examiner_name: "",
+    participants: "",
+    status: "ENTWURF",
+    result: "offen",
+    customer_id: "",
+    location_id: "",
+    contact_id: "",
+    examiner_id: "",
+    operator_name: "",
+    device_id: "",
+    equipment_ids: [],
+    environment_conditions: {
+      room_temperature: "",
+      humidity: "",
+      test_time: "",
+      checks: [
+        { text: "Raumbedingungen stabil", value: "na", comment: "" },
+        { text: "Aufstellort frei zugaenglich", value: "na", comment: "" },
+        { text: "Medienversorgung verfuegbar", value: "na", comment: "" }
+      ]
+    },
+    documentation_checklist: checklist(checklistTexts),
+    performance_checklist: checklist(performanceTexts),
+    programs: [
+      { name: "Vakuumtest", selected: false, custom: false },
+      { name: "Bowie-Dick / Leerkammerprofil", selected: false, custom: false },
+      { name: "134 C hohl verpackt", selected: false, custom: false }
+    ],
+    loading_patterns: [1, 2, 3].map((run) => ({ run, pattern: "", description: "", images: [] })),
+    measurement_data: ["Vakuumtest", "Leerkammerprofil", "Testlauf 1", "Testlauf 2", "Testlauf 3"].map((name) => ({
+      name,
+      start_time: "",
+      end_time: "",
+      duration: "",
+      leak_rate: "",
+      min_temperature: "",
+      max_temperature: "",
+      temperature_band: "",
+      equilibration_time: "",
+      holding_time: "",
+      pressure: "",
+      result: "",
+      imports: []
+    })),
+    drying: { start_weight: "", end_weight: "", difference: "", rating: "", comment: "" },
+    recommendations: [],
+    attachments: []
+  };
+}
+
+function Accordion({ title, children, defaultOpen = false }: { title: string; children: React.ReactNode; defaultOpen?: boolean }) {
+  const [open, setOpen] = useState(defaultOpen);
+  return (
+    <section className="rounded-lg border border-border bg-surface shadow-soft">
+      <button type="button" onClick={() => setOpen((value) => !value)} className="flex w-full items-center justify-between px-5 py-4 text-left text-lg font-semibold hover:bg-background">
+        {title}
+        <ChevronDown className={`h-5 w-5 transition ${open ? "rotate-180" : ""}`} />
+      </button>
+      {open && <div className="border-t border-border p-5">{children}</div>}
+    </section>
+  );
+}
+
+function Field({ label, children }: { label: string; children: React.ReactNode }) {
+  return <label className="block"><span className="text-sm font-medium text-text">{label}</span><div className="mt-2">{children}</div></label>;
+}
+
+const inputClass = "h-12 w-full rounded-lg border border-border bg-white px-4 outline-none focus:border-primary";
+const selectClass = inputClass;
+const areaClass = "min-h-24 w-full rounded-lg border border-border bg-white px-4 py-3 outline-none focus:border-primary";
+
+export function ValidationEditor({ validationId }: { validationId?: string }) {
+  const { token } = useAuth();
+  const client = useQueryClient();
+  const [draftId, setDraftId] = useState<string | null>(validationId ?? null);
+  const [lastSaved, setLastSaved] = useState<string>("");
+  const [formMessage, setFormMessage] = useState("");
+  const [reviewResult, setReviewResult] = useState<ReviewResult | null>(null);
+  const [saveState, setSaveState] = useState<ActionState>("normal");
+  const [reviewState, setReviewState] = useState<ActionState>("normal");
+  const [pdfState, setPdfState] = useState<ActionState>("normal");
+  const autosaveTimer = useRef<ReturnType<typeof setTimeout> | null>(null);
+
+  const nextNumber = useQuery({ queryKey: ["next-report-number", token], queryFn: () => apiGet<{ report_number: string }>("/validations/next-report-number", token ?? ""), enabled: Boolean(token) });
+  const customers = useQuery({ queryKey: ["customers-options", token], queryFn: () => apiGet<Paginated<Customer>>("/customers?page=1&page_size=100", token ?? ""), enabled: Boolean(token) });
+  const locations = useQuery({ queryKey: ["locations-options", token], queryFn: () => apiGet<Paginated<Location>>("/locations?page=1&page_size=100", token ?? ""), enabled: Boolean(token) });
+  const contacts = useQuery({ queryKey: ["contacts-options", token], queryFn: () => apiGet<Paginated<Contact>>("/contacts?page=1&page_size=100", token ?? ""), enabled: Boolean(token) });
+  const devices = useQuery({ queryKey: ["devices-options", token], queryFn: () => apiGet<Paginated<Device>>("/devices?page=1&page_size=100", token ?? ""), enabled: Boolean(token) });
+  const equipment = useQuery({ queryKey: ["equipment-options", token], queryFn: () => apiGet<Paginated<Equipment>>("/equipment?page=1&page_size=100", token ?? ""), enabled: Boolean(token) });
+  const existingValidation = useQuery({ queryKey: ["validation", validationId, token], queryFn: () => apiGet<ValidationItem>(`/validations/${validationId}`, token ?? ""), enabled: Boolean(token && validationId) });
+
+  const form = useForm<FormValues>({ resolver: zodResolver(schema), defaultValues: defaults() });
+  const watched = useWatch({ control: form.control });
+  const selectedDevice = devices.data?.items.find((item) => item.id === form.watch("device_id"));
+  const selectedEquipment = equipment.data?.items.filter((item) => form.watch("equipment_ids").includes(item.id)) ?? [];
+  const recommendations = useFieldArray({ control: form.control, name: "recommendations" });
+  const attachments = useFieldArray({ control: form.control, name: "attachments" });
+
+  useEffect(() => {
+    if (nextNumber.data?.report_number && !form.getValues("report_number")) {
+      form.setValue("report_number", nextNumber.data.report_number);
+    }
+  }, [form, nextNumber.data]);
+
+  useEffect(() => {
+    if (!existingValidation.data) return;
+    const data = existingValidation.data;
+    form.reset({
+      ...defaults(),
+      ...data,
+      result: data.result ?? "offen",
+      project: data.project ?? "",
+      test_location: data.test_location ?? "",
+      examiner_name: data.examiner_name ?? "",
+      participants: data.participants ?? "",
+      operator_name: data.operator_name ?? "",
+      performed_on: data.performed_on ?? "",
+      next_validation_on: data.next_validation_on ?? "",
+      contact_id: data.contact_id ?? "",
+      examiner_id: "",
+      location_id: data.location_id ?? "",
+      device_id: data.device_id ?? ""
+    });
+    setDraftId(data.id);
+  }, [existingValidation.data, form]);
+
+  const readonly = existingValidation.data?.status === "FREIGEGEBEN" || existingValidation.data?.status === "ABGESCHLOSSEN";
+
+  const saveMutation = useMutation({
+    mutationFn: (values: FormValues) => apiSend<ValidationItem>(draftId ? `/validations/${draftId}` : "/validations", token ?? "", draftId ? "PUT" : "POST", normalizeValidationPayload(values)),
+    onSuccess: (item) => {
+      setDraftId(item.id);
+      setLastSaved(new Date().toLocaleTimeString("de-DE", { hour: "2-digit", minute: "2-digit" }));
+      setFormMessage("");
+      setSaveState("success");
+      window.setTimeout(() => setSaveState("normal"), 1500);
+      client.invalidateQueries({ queryKey: ["dashboard"] });
+    },
+    onError: (error) => {
+      setSaveState("error");
+      setFormMessage(error instanceof Error ? error.message : "Speichern fehlgeschlagen.");
+    }
+  });
+
+  useEffect(() => {
+    if (readonly || !token || !watched.report_number || !watched.validation_type || !watched.customer_id || !watched.location_id || !watched.device_id || !watched.examiner_name || !watched.performed_on) return;
+    if (autosaveTimer.current) clearTimeout(autosaveTimer.current);
+    autosaveTimer.current = setTimeout(() => {
+      const values = form.getValues();
+      saveMutation.mutate(values);
+    }, 2500);
+    return () => {
+      if (autosaveTimer.current) clearTimeout(autosaveTimer.current);
+    };
+  }, [form, saveMutation, token, watched]);
+
+  const customerOptions = customers.data?.items ?? [];
+  const selectedCustomer = customerOptions.find((item) => item.id === form.watch("customer_id"));
+  const filteredLocations = (locations.data?.items ?? []).filter((item) => !form.watch("customer_id") || item.customer_id === form.watch("customer_id"));
+  const filteredContacts = (contacts.data?.items ?? []).filter((item) => !form.watch("customer_id") || item.customer_id === form.watch("customer_id"));
+  const filteredDevices = (devices.data?.items ?? []).filter((item) => !form.watch("customer_id") || item.customer_id === form.watch("customer_id"));
+
+  const calibrationWarnings = useMemo(() => selectedEquipment.filter((item) => item.calibration_due_on && item.calibration_due_on < today), [selectedEquipment]);
+
+  function missingRequired(values = form.getValues()) {
+    return Object.entries(requiredLabels).filter(([field]) => !values[field as keyof FormValues]);
+  }
+
+  function scrollToFirstMissing() {
+    const first = missingRequired()[0];
+    if (!first) return false;
+    setFormMessage(`${first[1].label} fehlt in ${first[1].section}.`);
+    document.querySelector(`[name="${first[0]}"]`)?.scrollIntoView({ behavior: "smooth", block: "center" });
+    return true;
+  }
+
+  function submit(values: FormValues) {
+    if (readonly) {
+      setFormMessage("Diese Validierung ist schreibgeschuetzt.");
+      return;
+    }
+    if (missingRequired(values).length) {
+      setSaveState("error");
+      scrollToFirstMissing();
+      return;
+    }
+    setSaveState("loading");
+    saveMutation.mutate(values);
+  }
+
+  async function reviewValidation() {
+    if (readonly) {
+      setFormMessage("Diese Validierung ist schreibgeschuetzt.");
+      return;
+    }
+    if (missingRequired().length) {
+      setReviewState("error");
+      scrollToFirstMissing();
+      return;
+    }
+    try {
+      setReviewState("loading");
+      const saved = draftId ? null : await saveMutation.mutateAsync(form.getValues());
+      const id = draftId ?? saved?.id;
+      if (!id || !token) return;
+      const response = await fetch(`${API_BASE}/validations/${id}/review`, { method: "POST", headers: { Authorization: `Bearer ${token}` } });
+      const result = (await response.json()) as ReviewResult;
+      setReviewResult(result);
+      setReviewState("success");
+      window.setTimeout(() => setReviewState("normal"), 1500);
+      setFormMessage(result.errors.length ? "Pruefung abgeschlossen: Fehler blockieren die Freigabe." : "Pruefung abgeschlossen: keine blockierenden Fehler.");
+    } catch (error) {
+      setReviewState("error");
+      setFormMessage(error instanceof Error ? error.message : "Pruefung fehlgeschlagen.");
+    }
+  }
+
+  function addFiles(files: FileList | null, category: string) {
+    if (!files) return;
+    Array.from(files).forEach((file, index) => attachments.append({ category, filename: file.name, description: "", order: attachments.fields.length + index + 1, preview: URL.createObjectURL(file) }));
+  }
+
+  async function openReportPreview() {
+    if (!draftId || !token) return;
+    const response = await fetch(`${API_BASE}/validations/${draftId}/report.html`, {
+      headers: { Authorization: `Bearer ${token}` }
+    });
+    const html = await response.text();
+    const preview = window.open("", "_blank");
+    if (preview) {
+      preview.document.write(html);
+      preview.document.close();
+    }
+  }
+
+  async function downloadReport() {
+    if (!draftId || !token) return;
+    try {
+      setPdfState("loading");
+      const response = await fetch(`${API_BASE}/validations/${draftId}/report.pdf`, {
+        headers: { Authorization: `Bearer ${token}` }
+      });
+      if (!response.ok) throw new Error("PDF konnte nicht erzeugt werden.");
+      const blob = await response.blob();
+      const url = URL.createObjectURL(blob);
+      const link = document.createElement("a");
+      link.href = url;
+      link.download = `${form.getValues("report_number")}.pdf`;
+      link.click();
+      URL.revokeObjectURL(url);
+      setPdfState("success");
+      window.setTimeout(() => setPdfState("normal"), 1500);
+    } catch (error) {
+      setPdfState("error");
+      setFormMessage(error instanceof Error ? error.message : "PDF-Download fehlgeschlagen.");
+    }
+  }
+
+  return (
+    <form onSubmit={form.handleSubmit(submit)} className="space-y-5 pb-28">
+      <header>
+        <h1 className="text-3xl font-semibold text-text">Validierungsbericht</h1>
+        <p className="mt-2 text-text-light">{readonly ? "Schreibgeschuetzte freigegebene oder abgeschlossene Validierung." : "Eine responsive Seite fuer Erfassung, Pruefung und Berichtserstellung."}</p>
+      </header>
+
+      <Accordion title="1. Allgemeine Angaben" defaultOpen>
+        <div className="grid gap-4 md:grid-cols-2">
+          <Field label="Berichtsnummer *"><input className={inputClass} {...form.register("report_number")} /></Field>
+          <Field label="Validierungsart *"><select className={selectClass} {...form.register("validation_type")}><option>Erstvalidierung</option><option>Revalidierung</option><option>Leistungsbeurteilung</option><option>Sonderpruefung</option></select></Field>
+          <Field label="Projekt"><input className={inputClass} {...form.register("project")} /></Field>
+          <Field label="Pruefdatum *"><input type="date" className={inputClass} {...form.register("performed_on")} /></Field>
+          <Field label="Revalidierungsintervall Monate"><input type="number" className={inputClass} {...form.register("revalidation_interval_months")} /></Field>
+          <Field label="Naechste Validierung"><input type="date" className={inputClass} {...form.register("next_validation_on")} onChange={(event) => { form.setValue("next_validation_manually_overridden", true); form.setValue("next_validation_on", event.target.value); }} /></Field>
+          <Field label="Pruefungsort"><input className={inputClass} {...form.register("test_location")} /></Field>
+          <Field label="Pruefer *"><input className={inputClass} {...form.register("examiner_name")} /></Field>
+          <Field label="Mitwirkende Personen"><textarea className={areaClass} {...form.register("participants")} /></Field>
+          <Field label="Status"><select className={selectClass} {...form.register("status")}><option value="ENTWURF">Entwurf</option><option value="BEREIT_ZUR_PRUEFUNG">Bereit zur Pruefung</option><option value="IN_PRUEFUNG">In Pruefung</option><option value="FREIGEGEBEN">Freigegeben</option><option value="ABGESCHLOSSEN">Abgeschlossen</option><option value="STORNIERT">Storniert</option></select></Field>
+          <Field label="Gesamtergebnis"><select className={selectClass} {...form.register("result")}><option value="offen">Offen</option><option value="bestanden">Bestanden</option><option value="nicht_bestanden">Nicht bestanden</option><option value="mit_auflagen">Mit Auflagen</option></select></Field>
+        </div>
+      </Accordion>
+
+      <Accordion title="2. Kunde und Standort">
+        <div className="grid gap-4 md:grid-cols-2">
+          <Field label="Kunde *"><select className={selectClass} {...form.register("customer_id")}><option value="">Bitte waehlen</option>{customerOptions.map((item) => <option key={item.id} value={item.id}>{item.name}</option>)}</select></Field>
+          <Field label="Standort *"><select className={selectClass} {...form.register("location_id")}><option value="">Bitte waehlen</option>{filteredLocations.map((item) => <option key={item.id} value={item.id}>{item.name}</option>)}</select></Field>
+          <Field label="Ansprechpartner"><select className={selectClass} {...form.register("contact_id")}><option value="">Bitte waehlen</option>{filteredContacts.map((item) => <option key={item.id} value={item.id}>{item.full_name}</option>)}</select></Field>
+          <Field label="Betreiber"><input className={inputClass} {...form.register("operator_name")} /></Field>
+          <Field label="QM-/Hygienebeauftragter"><input className={inputClass} value={[selectedCustomer?.quality_manager, selectedCustomer?.hygiene_officer].filter(Boolean).join(" / ")} readOnly /></Field>
+        </div>
+      </Accordion>
+
+      <Accordion title="3. Geraet">
+        <Field label="Geraet *"><select className={selectClass} {...form.register("device_id")}><option value="">Bitte waehlen</option>{filteredDevices.map((item) => <option key={item.id} value={item.id}>{item.manufacturer} {item.model} - {item.serial_number}</option>)}</select></Field>
+        <div className="mt-4 grid gap-4 md:grid-cols-3">{[
+          ["Hersteller", selectedDevice?.manufacturer],
+          ["Modell", selectedDevice?.model],
+          ["Seriennummer", selectedDevice?.serial_number],
+          ["Baujahr", selectedDevice?.year_built],
+          ["Inbetriebnahme", selectedDevice?.commissioned_on],
+          ["Kammervolumen", selectedDevice?.chamber_volume_liters],
+          ["Dampferzeugung", selectedDevice?.steam_generation],
+          ["Wasseraufbereitung", selectedDevice?.water_treatment],
+          ["Dokumentation", selectedDevice?.documentation],
+          ["Lieferant", selectedDevice?.supplier]
+        ].map(([label, value]) => <div key={label as string} className="rounded-lg border border-border bg-background p-4"><p className="text-xs text-text-light">{label}</p><p className="mt-1 font-medium">{String(value ?? "-")}</p></div>)}</div>
+      </Accordion>
+
+      <Accordion title="4. Pruefmittel">
+        <Controller control={form.control} name="equipment_ids" render={({ field }) => (
+          <div className="grid gap-3 md:grid-cols-2">
+            {(equipment.data?.items ?? []).map((item) => {
+              const expired = Boolean(item.calibration_due_on && item.calibration_due_on < today);
+              return <label key={item.id} className="flex items-start gap-3 rounded-lg border border-border p-4"><input type="checkbox" className="mt-1 h-5 w-5" checked={field.value.includes(item.id)} onChange={(event) => field.onChange(event.target.checked ? [...field.value, item.id] : field.value.filter((id: string) => id !== item.id))} /><span><strong>{item.kind}</strong><br />{item.serial_number} · {item.calibrated_on ?? "-"} · {item.status}{expired && <span className="ml-2 text-danger">Kalibrierung abgelaufen</span>}</span></label>;
+            })}
+          </div>
+        )} />
+        {calibrationWarnings.length > 0 && <p className="mt-4 rounded-lg border border-danger/30 bg-danger/5 p-4 text-danger">Mindestens ein ausgewaehltes Pruefmittel hat eine abgelaufene Kalibrierung.</p>}
+      </Accordion>
+
+      <Accordion title="5. Umgebungsbedingungen">
+        <div className="grid gap-4 md:grid-cols-3">
+          <Field label="Raumtemperatur"><input className={inputClass} {...form.register("environment_conditions.room_temperature")} /></Field>
+          <Field label="relative Luftfeuchtigkeit"><input className={inputClass} {...form.register("environment_conditions.humidity")} /></Field>
+          <Field label="Pruefzeit"><input className={inputClass} {...form.register("environment_conditions.test_time")} /></Field>
+        </div>
+        {[0, 1, 2].map((index) => <ChecklistRow key={index} form={form} path={`environment_conditions.checks.${index}`} />)}
+      </Accordion>
+
+      <Accordion title="6. Dokumentations- und Leistungschecklisten">
+        <h3 className="font-semibold">Dokumentation</h3>{checklistTexts.map((_, index) => <ChecklistRow key={index} form={form} path={`documentation_checklist.${index}`} />)}
+        <h3 className="mt-6 font-semibold">Leistung</h3>{performanceTexts.map((_, index) => <ChecklistRow key={index} form={form} path={`performance_checklist.${index}`} />)}
+      </Accordion>
+
+      <Accordion title="7. Programme">
+        {[0, 1, 2].map((index) => <ProgramRow key={index} form={form} index={index} />)}
+        <ActionButton type="button" icon={<Plus className="h-4 w-4" />} onClick={() => form.setValue("programs", [...form.getValues("programs"), { name: "", selected: true, custom: true }])} className="mt-4">Eigenes Programm</ActionButton>
+      </Accordion>
+
+      <Accordion title="8. Beladungsmuster">
+        {[0, 1, 2].map((index) => <LoadingRun key={index} form={form} index={index} />)}
+      </Accordion>
+
+      <Accordion title="9. Messdaten">
+        {[0, 1, 2, 3, 4].map((index) => <MeasurementBlock key={index} form={form} index={index} />)}
+      </Accordion>
+
+      <Accordion title="10. Trocknung">
+        <div className="grid gap-4 md:grid-cols-2">
+          {["start_weight", "end_weight", "difference", "rating"].map((name) => <Field key={name} label={name}><input className={inputClass} {...form.register(`drying.${name}`)} /></Field>)}
+          <Field label="Bemerkung"><textarea className={areaClass} {...form.register("drying.comment")} /></Field>
+        </div>
+      </Accordion>
+
+      <Accordion title="11. Empfehlungen und Auflagen">
+        {recommendations.fields.map((field, index) => <div key={field.id} className="mb-3 grid gap-3 rounded-lg border border-border p-4 md:grid-cols-4"><input className={inputClass} placeholder="Nummer" {...form.register(`recommendations.${index}.number`)} /><input className={inputClass} placeholder="Text" {...form.register(`recommendations.${index}.text`)} /><input type="date" className={inputClass} {...form.register(`recommendations.${index}.deadline`)} /><input className={inputClass} placeholder="Status" {...form.register(`recommendations.${index}.status`)} /></div>)}
+        <ActionButton type="button" icon={<Plus className="h-4 w-4" />} onClick={() => recommendations.append({ number: recommendations.fields.length + 1, text: "", deadline: "", status: "offen" })}>Zeile hinzufuegen</ActionButton>
+      </Accordion>
+
+      <Accordion title="12. Bilder und Anlagen">
+        <div className="grid gap-3 md:grid-cols-2">{attachmentCategories.map((category) => <label key={category} className="rounded-lg border border-dashed border-primary/40 p-4"><UploadCloud className="mb-2 h-5 w-5 text-primary" />{category}<input type="file" multiple className="mt-3 block w-full text-sm" onChange={(event) => addFiles(event.target.files, category)} /></label>)}</div>
+        <div className="mt-5 grid gap-3 md:grid-cols-2">{attachments.fields.map((field, index) => <div key={field.id} className="rounded-lg border border-border p-4"><div className="flex justify-between gap-3"><strong>{String(form.watch(`attachments.${index}.filename`) ?? "")}</strong><button type="button" onClick={() => attachments.remove(index)}><X className="h-4 w-4 text-danger" /></button></div><input className={`${inputClass} mt-3`} placeholder="Beschreibung" {...form.register(`attachments.${index}.description`)} /><input className={`${inputClass} mt-3`} placeholder="Reihenfolge" {...form.register(`attachments.${index}.order`)} /></div>)}</div>
+      </Accordion>
+
+      {reviewResult && <section className="rounded-lg border border-border bg-surface p-5 shadow-soft"><h2 className="text-xl font-semibold">Pruefergebnis</h2><div className="mt-4 grid gap-4 md:grid-cols-3"><IssueList title="Fehler" items={reviewResult.errors} tone="danger" /><IssueList title="Warnungen" items={reviewResult.warnings} tone="warning" /><div><h3 className="font-semibold text-success">Vollstaendige Bereiche</h3>{reviewResult.complete_sections.map((item) => <p key={item} className="mt-2 text-sm">{item}</p>)}</div></div></section>}
+      {saveMutation.isError && formMessage && <div className="fixed right-4 top-4 z-50 max-w-md rounded-lg border border-danger/30 bg-white p-4 text-sm text-danger shadow-soft">{formMessage}</div>}
+      <fieldset disabled={readonly} className={readonly ? "pointer-events-none contents opacity-80" : "contents"}></fieldset>
+      <div className="fixed inset-x-0 bottom-0 z-40 border-t border-border bg-surface/95 px-4 py-3 shadow-soft backdrop-blur">
+        <div className="mx-auto flex max-w-7xl flex-wrap items-center justify-between gap-3">
+          <div className="text-sm text-text-light"><p>{lastSaved ? `Automatisch gespeichert um ${lastSaved}` : "Autosave startet nach Ausfuellen der Pflichtfelder."}</p>{missingRequired().length > 0 && <p className="text-danger">Fehlt: {missingRequired().map(([, value]) => value.label).join(", ")}</p>}{formMessage && <p className="text-primary-dark">{formMessage}</p>}</div>
+          <div className="flex flex-wrap gap-2">
+            <ActionButton type="submit" disabled={readonly} disabledReason="Freigegebene und abgeschlossene Validierungen sind schreibgeschuetzt" icon={<Save className="h-4 w-4" />} state={saveState} loadingText="Speichern..." successText="Gespeichert">Entwurf speichern</ActionButton>
+            <ActionButton type="button" disabled={readonly} disabledReason="Freigegebene und abgeschlossene Validierungen sind schreibgeschuetzt" icon={<ShieldCheck className="h-4 w-4" />} state={reviewState} loadingText="Pruefung laeuft..." successText="Geprueft" onClick={reviewValidation}>Bericht pruefen</ActionButton>
+            <ActionButton type="button" variant="primary" icon={<FileText className="h-4 w-4" />} onClick={() => draftId ? window.location.assign(`/validations/${draftId}/preview`) : scrollToFirstMissing()}>HTML-Vorschau</ActionButton>
+            <ActionButton type="button" icon={<Download className="h-4 w-4" />} state={pdfState} loadingText="PDF wird erzeugt..." successText="PDF erzeugt" onClick={() => draftId ? downloadReport() : scrollToFirstMissing()}>PDF herunterladen</ActionButton>
+          </div>
+        </div>
+      </div>
+    </form>
+  );
+}
+
+function ChecklistRow({ form, path }: { form: ReturnType<typeof useForm<FormValues>>; path: string }) {
+  return <div className="mt-3 grid gap-3 rounded-lg border border-border p-4 md:grid-cols-[1fr_180px_1fr]"><input className={inputClass} readOnly {...form.register(`${path}.text` as never)} /><select className={selectClass} {...form.register(`${path}.value` as never)}>{triState.map((value) => <option key={value} value={value}>{value === "yes" ? "Ja" : value === "no" ? "Nein" : "Nicht zutreffend"}</option>)}</select><input className={inputClass} placeholder="Kommentar" {...form.register(`${path}.comment` as never)} /></div>;
+}
+
+function IssueList({ title, items, tone }: { title: string; items: ReviewIssue[]; tone: "danger" | "warning" }) {
+  return <div><h3 className={`font-semibold ${tone === "danger" ? "text-danger" : "text-warning"}`}>{title}</h3>{items.length === 0 ? <p className="mt-2 text-sm text-text-light">Keine Eintraege.</p> : items.map((item) => <p key={`${item.field}-${item.message}`} className="mt-2 text-sm">{item.section}: {item.message}</p>)}</div>;
+}
+
+function ProgramRow({ form, index }: { form: ReturnType<typeof useForm<FormValues>>; index: number }) {
+  return <div className="mb-3 grid gap-3 rounded-lg border border-border p-4 md:grid-cols-[80px_1fr]"><input type="checkbox" className="h-6 w-6" {...form.register(`programs.${index}.selected`)} /><input className={inputClass} {...form.register(`programs.${index}.name`)} /></div>;
+}
+
+function LoadingRun({ form, index }: { form: ReturnType<typeof useForm<FormValues>>; index: number }) {
+  return <div className="mb-4 rounded-lg border border-border p-4"><h3 className="font-semibold">Testlauf {index + 1}</h3><div className="mt-3 grid gap-3 md:grid-cols-2"><input className={inputClass} placeholder="Beladungsmuster" {...form.register(`loading_patterns.${index}.pattern`)} /><input className={inputClass} placeholder="Beschreibung" {...form.register(`loading_patterns.${index}.description`)} /><input type="file" multiple className="rounded-lg border border-border p-3 md:col-span-2" /></div></div>;
+}
+
+function MeasurementBlock({ form, index }: { form: ReturnType<typeof useForm<FormValues>>; index: number }) {
+  const fields = ["start_time", "end_time", "duration", "leak_rate", "min_temperature", "max_temperature", "temperature_band", "equilibration_time", "holding_time", "pressure", "result"];
+  return <div className="mb-4 rounded-lg border border-border p-4"><h3 className="font-semibold">{String(form.watch(`measurement_data.${index}.name`) ?? "")}</h3><div className="mt-3 grid gap-3 md:grid-cols-3">{fields.map((field) => <input key={field} className={inputClass} placeholder={field} {...form.register(`measurement_data.${index}.${field}`)} />)}<input type="file" multiple accept=".csv,.pdf" className="rounded-lg border border-border p-3 md:col-span-3" /></div></div>;
+}
+
+export default ValidationEditor;
diff --git a/validation-suite/frontend/atlas/lib/api.ts b/validation-suite/frontend/atlas/lib/api.ts
index 0d843d85..497ec180 100644
--- a/validation-suite/frontend/atlas/lib/api.ts
+++ b/validation-suite/frontend/atlas/lib/api.ts
@@ -78,6 +78,10 @@ export type ValidationItem = Entity & {
   scheduled_on?: string | null;
   performed_on?: string | null;
   next_validation_on?: string | null;
+  revalidation_interval_months: number;
+  next_validation_manually_overridden: boolean;
+  version: number;
+  previous_validation_id?: string | null;
   equipment_ids: string[];
   environment_conditions: Record<string, unknown>;
   documentation_checklist: Record<string, unknown>[];
@@ -90,6 +94,14 @@ export type ValidationItem = Entity & {
   attachments: Record<string, unknown>[];
 };
 
+export function normalizeValidationPayload<T extends Record<string, unknown>>(values: T): T {
+  const optionalForeignKeys = ["contact_id", "examiner_id"];
+  return {
+    ...values,
+    ...Object.fromEntries(optionalForeignKeys.map((key) => [key, values[key] || null]))
+  };
+}
+
 export type Paginated<T> = {
   items: T[];
   total: number;