diff --git a/backend/alembic/versions/0001_initial.py b/backend/alembic/versions/0001_initial.py
index fb469cc..3739d22 100644
--- a/backend/alembic/versions/0001_initial.py
+++ b/backend/alembic/versions/0001_initial.py
@@ -30,7 +30,7 @@ def upgrade() -> None:
         "configs",
         sa.Column("id", sa.Integer, primary_key=True),
         sa.Column("name", sa.String(128), nullable=False),
-        sa.Column("description", sa.Text, server_default=""),
+        sa.Column("description", sa.Text, server_default="''"),
         sa.Column("is_active", sa.Boolean, server_default="true"),
         sa.Column("created_at", sa.DateTime, server_default=sa.func.now()),
         sa.Column("updated_at", sa.DateTime, server_default=sa.func.now()),
@@ -42,7 +42,7 @@ def upgrade() -> None:
         sa.Column("config_id", sa.Integer, sa.ForeignKey("configs.id"), nullable=False),
         sa.Column("name", sa.String(32), nullable=False),
         sa.Column("type", sa.String(16), nullable=False),
-        sa.Column("options", sa.Text, server_default=""),
+        sa.Column("options", sa.Text, server_default="''"),
         sa.UniqueConstraint("config_id", "name", name="uq_zone_name_per_config"),
     )
     op.create_table(
@@ -51,7 +51,7 @@ def upgrade() -> None:
         sa.Column("config_id", sa.Integer, sa.ForeignKey("configs.id"), nullable=False),
         sa.Column("name", sa.String(32), nullable=False),
         sa.Column("zone_id", sa.Integer, sa.ForeignKey("zones.id"), nullable=False),
-        sa.Column("options", sa.Text, server_default=""),
+        sa.Column("options", sa.Text, server_default="''"),
     )
     op.create_table(
         "policies",
@@ -60,8 +60,8 @@ def upgrade() -> None:
         sa.Column("src_zone_id", sa.Integer, sa.ForeignKey("zones.id"), nullable=False),
         sa.Column("dst_zone_id", sa.Integer, sa.ForeignKey("zones.id"), nullable=False),
         sa.Column("policy", sa.String(16), nullable=False),
-        sa.Column("log_level", sa.String(16), server_default=""),
-        sa.Column("comment", sa.Text, server_default=""),
+        sa.Column("log_level", sa.String(16), server_default="''"),
+        sa.Column("comment", sa.Text, server_default="''"),
         sa.Column("position", sa.Integer, server_default="0"),
     )
     op.create_table(
@@ -71,12 +71,12 @@ def upgrade() -> None:
         sa.Column("action", sa.String(32), nullable=False),
         sa.Column("src_zone_id", sa.Integer, sa.ForeignKey("zones.id"), nullable=True),
         sa.Column("dst_zone_id", sa.Integer, sa.ForeignKey("zones.id"), nullable=True),
-        sa.Column("src_ip", sa.String(64), server_default=""),
-        sa.Column("dst_ip", sa.String(64), server_default=""),
-        sa.Column("proto", sa.String(16), server_default=""),
-        sa.Column("dport", sa.String(64), server_default=""),
-        sa.Column("sport", sa.String(64), server_default=""),
-        sa.Column("comment", sa.Text, server_default=""),
+        sa.Column("src_ip", sa.String(64), server_default="''"),
+        sa.Column("dst_ip", sa.String(64), server_default="''"),
+        sa.Column("proto", sa.String(16), server_default="''"),
+        sa.Column("dport", sa.String(64), server_default="''"),
+        sa.Column("sport", sa.String(64), server_default="''"),
+        sa.Column("comment", sa.Text, server_default="''"),
         sa.Column("position", sa.Integer, server_default="0"),
     )
     op.create_table(
@@ -85,8 +85,8 @@ def upgrade() -> None:
         sa.Column("config_id", sa.Integer, sa.ForeignKey("configs.id"), nullable=False),
         sa.Column("source_network", sa.String(64), nullable=False),
         sa.Column("out_interface", sa.String(32), nullable=False),
-        sa.Column("to_address", sa.String(64), server_default=""),
-        sa.Column("comment", sa.Text, server_default=""),
+        sa.Column("to_address", sa.String(64), server_default="''"),
+        sa.Column("comment", sa.Text, server_default="''"),
     )
 
     # --- Seed data ---
diff --git a/backend/app/api/configs.py b/backend/app/api/configs.py
index 8a06220..cb029fa 100644
--- a/backend/app/api/configs.py
+++ b/backend/app/api/configs.py
@@ -82,7 +82,7 @@ def generate_config(
     format: str = "json",
     db: Session = Depends(get_db),
     current_user: models.User = Depends(get_current_user),
-) -> Response:
+):
     config = (
         db.query(models.Config)
         .options(
diff --git a/frontend/src/store/auth.ts b/frontend/src/store/auth.ts
index fdb4721..da67465 100644
--- a/frontend/src/store/auth.ts
+++ b/frontend/src/store/auth.ts
@@ -10,20 +10,22 @@ export interface User {
 
 // Simple module-level state (no external lib needed)
 let currentUser: User | null = null
+let isLoading = true
+let fetchPromise: Promise<void> | null = null
 const listeners = new Set<() => void>()
 
 export function useAuth() {
   const [user, setUser] = useState<User | null>(currentUser)
-  const [loading, setLoading] = useState(currentUser === null)
+  const [loading, setLoading] = useState(isLoading)
 
   useEffect(() => {
-    const update = () => setUser(currentUser)
+    const update = () => { setUser(currentUser); setLoading(isLoading) }
     listeners.add(update)
-    if (currentUser === null) {
-      authApi.me()
-        .then((res) => { currentUser = res.data; listeners.forEach((l) => l()) })
-        .catch(() => { currentUser = null; listeners.forEach((l) => l()) })
-        .finally(() => setLoading(false))
+    if (!fetchPromise) {
+      fetchPromise = authApi.me()
+        .then((res) => { currentUser = res.data })
+        .catch(() => { currentUser = null })
+        .finally(() => { isLoading = false; listeners.forEach((l) => l()) })
     }
     return () => { listeners.delete(update) }
   }, [])