Initial FastAPI + SQLite + Alembic

fastapi_demo/app/repositories/assets_repo.py

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+from typing import Protocol
+from uuid import UUID
+from fastapi_demo.app.schemas.asset import AssetOut, AssetEventOut
+
+
+class AssetsRepo(Protocol):
+    def create(self, asset: AssetOut) -> None: ...
+    def get(self, asset_id: UUID) -> AssetOut | None: ...
+    def update(self, asset: AssetOut) -> None: ...
+    def add_event(self, event: AssetEventOut) -> None: ...
+    def list_events(self, asset_id: UUID) -> list[AssetEventOut]: ...

fastapi_demo/app/repositories/memory_assets_repo.py

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+from uuid import UUID
+from fastapi_demo.app.repositories.assets_repo import AssetsRepo
+from fastapi_demo.app.schemas.asset import AssetOut, AssetEventOut
+
+
+class MemoryAssetsRepo(AssetsRepo):
+    def __init__(self) -> None:
+        self.assets: dict[UUID, AssetOut] = {}
+        self.events: dict[UUID, list[AssetEventOut]] = {}
+
+    def create(self, asset: AssetOut) -> None:
+        self.assets[asset.id] = asset
+        self.events.setdefault(asset.id, [])
+
+    def get(self, asset_id: UUID) -> AssetOut | None:
+        return self.assets.get(asset_id)
+
+    def update(self, asset: AssetOut) -> None:
+        self.assets[asset.id] = asset
+
+    def add_event(self, event: AssetEventOut) -> None:
+        self.events.setdefault(event.asset_id, []).append(event)
+
+    def list_events(self, asset_id: UUID) -> list[AssetEventOut]:
+        return list(self.events.get(asset_id, []))

fastapi_demo/app/repositories/sql_assets_repo.py

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+from __future__ import annotations
+
+from datetime import datetime
+from uuid import UUID, uuid4
+
+from fastapi import HTTPException
+from sqlalchemy import select, update
+from sqlalchemy.orm import Session
+
+from fastapi_demo.app.db.models import Asset as AssetORM, AssetEvent as AssetEventORM
+from fastapi_demo.app.domain.status import AssetStatus
+from fastapi_demo.app.schemas.asset import AssetOut, AssetEventOut
+
+
+class SqlAssetsRepo:
+    def __init__(self, db: Session) -> None:
+        self.db = db
+
+    def create(self, asset: AssetOut) -> None:
+        row = AssetORM(
+            id=str(asset.id),
+            name=asset.name,
+            serial=asset.serial,
+            status=str(asset.status),
+            revision=asset.revision,  # <-- wichtig
+            created_at=asset.updated_at,  # MVP: created_at == updated_at
+            updated_at=asset.updated_at,
+        )
+        self.db.add(row)
+        self.db.commit()
+
+    def get(self, asset_id: UUID) -> AssetOut | None:
+        row = self.db.get(AssetORM, str(asset_id))
+        if not row:
+            return None
+        return AssetOut(
+            id=UUID(row.id),
+            name=row.name,
+            serial=row.serial,
+            status=AssetStatus(row.status),
+            revision=row.revision,  # <-- wichtig
+            updated_at=row.updated_at,
+        )
+
+    def transition_with_revision(
+        self,
+        asset_id: UUID,
+        expected_revision: int,
+        to_status: AssetStatus,
+        at: datetime,
+        note: str | None,
+    ) -> tuple[AssetOut, AssetEventOut]:
+
+        with self.db.begin():  # <-- begin ganz nach oben
+            current = self.db.get(AssetORM, str(asset_id))
+            if not current:
+                raise HTTPException(status_code=404, detail="Asset nicht gefunden")
+
+            from_status = AssetStatus(current.status)
+
+            stmt = (
+                update(AssetORM)
+                .where(
+                    AssetORM.id == str(asset_id),
+                    AssetORM.revision == expected_revision,
+                )
+                .values(
+                    status=str(to_status),
+                    updated_at=at,
+                    revision=expected_revision + 1,
+                )
+            )
+
+            res = self.db.execute(stmt)
+            if res.rowcount != 1:
+                # aktuelle Revision für saubere Fehlermeldung neu lesen
+                latest = self.db.get(AssetORM, str(asset_id))
+                raise HTTPException(
+                    status_code=409,
+                    detail={
+                        "message": "Revision-Konflikt",
+                        "expected_revision": expected_revision,
+                        "current_revision": latest.revision if latest else None,
+                    },
+                )
+
+            event_row = AssetEventORM(
+                id=str(uuid4()),
+                asset_id=str(asset_id),
+                from_status=str(from_status),
+                to_status=str(to_status),
+                at=at,
+                note=note,
+            )
+            self.db.add(event_row)
+
+        # nach Commit: updated Asset laden
+        updated = self.db.get(AssetORM, str(asset_id))
+        assert updated is not None
+
+        asset_out = AssetOut(
+            id=UUID(updated.id),
+            name=updated.name,
+            serial=updated.serial,
+            status=AssetStatus(updated.status),
+            revision=updated.revision,
+            updated_at=updated.updated_at,
+        )
+        event_out = AssetEventOut(
+            asset_id=asset_out.id,
+            from_status=from_status,
+            to_status=to_status,
+            at=at,
+            note=note,
+        )
+        return asset_out, event_out
+
+    def list_events(self, asset_id: UUID) -> list[AssetEventOut]:
+        stmt = (
+            select(AssetEventORM)
+            .where(AssetEventORM.asset_id == str(asset_id))
+            .order_by(AssetEventORM.at.asc())
+        )
+        rows = self.db.execute(stmt).scalars().all()
+        return [
+            AssetEventOut(
+                asset_id=UUID(r.asset_id),
+                from_status=AssetStatus(r.from_status),
+                to_status=AssetStatus(r.to_status),
+                at=r.at,
+                note=r.note,
+            )
+            for r in rows
+        ]