fixes and refactor

app/database/indexes.py

@@ -0,0 +1,31 @@
+"""
+Database secondary indexes helper.
+
+Creates small B-tree indexes for common equality filters to speed up searches.
+Uses CREATE INDEX IF NOT EXISTS so it is safe to call repeatedly at startup
+and works for existing databases without running a migration.
+"""
+from sqlalchemy.engine import Engine
+from sqlalchemy import text
+
+
+def ensure_secondary_indexes(engine: Engine) -> None:
+    statements = [
+        # Files
+        "CREATE INDEX IF NOT EXISTS idx_files_status ON files(status)",
+        "CREATE INDEX IF NOT EXISTS idx_files_file_type ON files(file_type)",
+        "CREATE INDEX IF NOT EXISTS idx_files_empl_num ON files(empl_num)",
+        # Ledger
+        "CREATE INDEX IF NOT EXISTS idx_ledger_t_type ON ledger(t_type)",
+        "CREATE INDEX IF NOT EXISTS idx_ledger_empl_num ON ledger(empl_num)",
+    ]
+    with engine.begin() as conn:
+        for stmt in statements:
+            try:
+                conn.execute(text(stmt))
+            except Exception:
+                # Ignore failures (e.g., non-SQLite engines that still support IF NOT EXISTS;
+                # if not supported, users should manage indexes via migrations)
+                pass
+
+