refactor

backend/app/db/dialect.py

@@ -0,0 +1,19 @@
+from sqlalchemy.engine import Engine
+
+
+def dialect_name(engine: Engine) -> str:
+    return engine.dialect.name
+
+
+def is_sqlite(engine: Engine) -> bool:
+    return dialect_name(engine) == "sqlite"
+
+
+def is_postgresql(engine: Engine) -> bool:
+    return dialect_name(engine) == "postgresql"
+
+
+def bool_literal(engine: Engine, value: bool = False) -> str:
+    if is_sqlite(engine):
+        return "1" if value else "0"
+    return "true" if value else "false"