feat: Add CI workflow for running tests and update database URL handling

config/database.py

@@ -1,5 +1,4 @@
 from sqlalchemy import create_engine
-from sqlalchemy.engine import URL
 from sqlalchemy.orm import declarative_base, sessionmaker
 import os
 from dotenv import load_dotenv
@@ -14,8 +13,8 @@ def _build_database_url() -> str:
     Falls back to `DATABASE_URL` for backward compatibility.
     """
 
-    legacy_url = os.environ.get("DATABASE_URL")
-    if legacy_url:
+    legacy_url = os.environ.get("DATABASE_URL", "")
+    if legacy_url and legacy_url.strip() != "":
         return legacy_url
 
     driver = os.environ.get("DATABASE_DRIVER", "postgresql")
@@ -42,17 +41,12 @@ def _build_database_url() -> str:
             f"granular variables ({', '.join(missing)})"
         )
 
-    url = URL.create(
-        drivername=driver,
-        username=user,
-        password=password,
-        host=host,
-        port=int(port) if port else None,
-        database=database,
-    )
-
+    url = f"{driver}://{user}:{password}@{host}"
+    if port:
+        url += f":{port}"
+    url += f"/{database}"
     if schema:
-        url = url.set(query={"options": f"-csearch_path={schema}"})
+        url += f"?options=-csearch_path={schema}"
 
     return str(url)