Initial project commit

server/app/db/migrations.py

@@ -0,0 +1,36 @@
+from pathlib import Path
+
+from alembic import command
+from alembic.config import Config
+from sqlalchemy import create_engine, text
+
+from app.core.config import settings
+
+
+def ensure_postgis_available() -> None:
+    engine = create_engine(settings.DATABASE_URL_SYNC, echo=False)
+
+    try:
+        with engine.connect() as connection:
+            result = connection.execute(
+                text("select 1 from pg_available_extensions where name = 'postgis'")
+            )
+            if result.scalar() != 1:
+                raise RuntimeError(
+                    "PostGIS is not available on the PostgreSQL server. "
+                    "Install/enable PostGIS before starting the backend."
+                )
+    finally:
+        engine.dispose()
+
+def run_startup_migrations() -> None:
+    ensure_postgis_available()
+
+    project_root = Path(__file__).resolve().parents[2]
+    alembic_ini = project_root / "alembic.ini"
+    alembic_dir = project_root / "alembic"
+
+    config = Config(str(alembic_ini))
+    config.set_main_option("script_location", str(alembic_dir))
+
+    command.upgrade(config, "head")