initial commit after split

src/govoplan_core/db/base.py

@@ -0,0 +1,39 @@
+from __future__ import annotations
+
+from datetime import datetime, timezone
+from typing import Any
+
+from sqlalchemy import JSON, MetaData
+from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
+from sqlalchemy.types import DateTime
+
+
+NAMING_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",
+}
+
+
+def utcnow() -> datetime:
+    return datetime.now(timezone.utc)
+
+
+class GovoplanBase(DeclarativeBase):
+    metadata = MetaData(naming_convention=NAMING_CONVENTION)
+
+    type_annotation_map = {
+        dict[str, Any]: JSON,
+        list[dict[str, Any]]: JSON,
+        list[str]: JSON,
+    }
+
+
+Base = GovoplanBase
+
+
+class TimestampMixin:
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow, nullable=False)
+    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utcnow, onupdate=utcnow, nullable=False)