updated db_seetup

backend/db_setup.py

@@ -76,7 +76,7 @@ class Settings(BaseSettings):
         return value
 
     def url(self, *, async_driver: bool = True) -> URL:
-        """DSN with the driver forced; `sslmode` is translated to asyncpg's `ssl`."""
+        """DSN with the driver forced; `sslmode` is mapped to asyncpg's `ssl` mode name."""
         url = (
             make_url(self.database_url)
             if self.database_url
@@ -92,8 +92,9 @@ class Settings(BaseSettings):
         query = dict(url.query)
         if self.db_sslmode:
             query.setdefault("sslmode", self.db_sslmode)
-        if async_driver and query.pop("sslmode", None) not in (None, "disable", "allow", "prefer"):
-            query["ssl"] = "true"
+        # asyncpg accepts ssl as an SSLMode name (require, verify-full, …), not "true".
+        if async_driver and (mode := query.pop("sslmode", None)) is not None:
+            query["ssl"] = mode
         driver = "asyncpg" if async_driver else "psycopg2"
         return url.set(drivername=f"postgresql+{driver}", query=query)