Phase 1 of Migration. Running Scripts

backend/migration/migrate_device_alerts.py

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+"""
+Phase 1 — Step 1.4: device_alerts  (SQLite → Postgres)
+
+device_alerts is a "current state" table — one row per (device_serial, subsystem).
+The SQLite PK is (device_serial, subsystem); Postgres adds a BIGSERIAL surrogate PK
+with a unique constraint on the pair.
+
+Run on VPS:
+    docker compose exec backend python -m migration.migrate_device_alerts
+"""
+
+import asyncio
+import sys
+
+from sqlalchemy import text
+
+from migration.utils import open_sqlite, AsyncPgSession, parse_dt, log_run, pg_count
+
+SCRIPT = "migrate_device_alerts"
+
+
+async def run() -> None:
+    sqlite = await open_sqlite()
+    rows = await sqlite.execute_fetchall("SELECT * FROM device_alerts")
+    await sqlite.close()
+
+    source_count = len(rows)
+    print(f"Source (SQLite): {source_count} device_alerts rows")
+
+    if source_count == 0:
+        print("Nothing to migrate.")
+        await log_run(SCRIPT, 0, 0, notes="source empty")
+        return
+
+    records = [
+        {
+            "device_serial": r["device_serial"],
+            "subsystem":     r["subsystem"],
+            "state":         r["state"],
+            "message":       r["message"],
+            "updated_at":    parse_dt(r["updated_at"]),
+        }
+        for r in rows
+    ]
+
+    async with AsyncPgSession() as session:
+        async with session.begin():
+            await session.execute(
+                text("""
+                    INSERT INTO device_alerts (device_serial, subsystem, state, message, updated_at)
+                    VALUES (:device_serial, :subsystem, :state, :message, :updated_at)
+                    ON CONFLICT (device_serial, subsystem) DO NOTHING
+                """),
+                records,
+            )
+            dest_count = await pg_count(session, "device_alerts")
+
+    if dest_count < source_count:
+        msg = f"Count mismatch: source={source_count}  postgres={dest_count}"
+        print(f"ERROR: {msg}", file=sys.stderr)
+        await log_run(SCRIPT, source_count, dest_count, success=False, notes=msg)
+        sys.exit(1)
+
+    print(f"Postgres: {dest_count} rows ✓")
+    await log_run(SCRIPT, source_count, dest_count)
+
+
+if __name__ == "__main__":
+    asyncio.run(run())