fix(db): check column existence before creating performance indexes

_ensure_indexes() now verifies the target column exists in the table
before executing CREATE INDEX IF NOT EXISTS. This prevents failures
when migrating legacy database schemas that don't yet have all columns
(e.g. files table without created_at or mime_type).

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

app/database.py

@@ -188,10 +188,14 @@ def _ensure_indexes(engine: Any, inspector: Any) -> None:
     ]
 
     table_names = inspector.get_table_names()
+    columns_by_table: dict[str, set[str]] = {}
     with engine.begin() as conn:
         for idx_name, table, column in _PERF_INDEXES:
             if table in table_names:
-                conn.execute(text(f"CREATE INDEX IF NOT EXISTS {idx_name} ON {table} ({column})"))
+                if table not in columns_by_table:
+                    columns_by_table[table] = {col["name"] for col in inspector.get_columns(table)}
+                if column in columns_by_table[table]:
+                    conn.execute(text(f"CREATE INDEX IF NOT EXISTS {idx_name} ON {table} ({column})"))
 
     logger.info("Performance indexes ensured")