feat(validation): complete validation editor and master data modules

validation-suite/backend/mercury/app/db/base.py

@@ -0,0 +1,31 @@
+from __future__ import annotations
+
+from datetime import datetime
+from uuid import uuid4
+
+from sqlalchemy import DateTime, MetaData, func
+from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
+
+convention = {
+    "ix": "ix_%(column_0_label)s",
+    "uq": "uq_%(table_name)s_%(column_0_name)s",
+    "ck": "ck_%(table_name)s_%(constraint_name)s",
+    "fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
+    "pk": "pk_%(table_name)s",
+}
+
+
+class Base(DeclarativeBase):
+    metadata = MetaData(naming_convention=convention)
+
+
+class UUIDMixin:
+    id: Mapped[str] = mapped_column(primary_key=True, default=lambda: str(uuid4()))
+
+
+class TimestampMixin:
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
+    )
+