Added DB connection and started creating api calls for the pages

backend/src/models.py

@@ -1,4 +1,4 @@
-from typing import Optional
+from typing import Optional, List
 from pydantic import BaseModel, SecretStr
 
 
@@ -13,6 +13,25 @@ class TokenResponse(BaseModel):
 
 
 class UserInfo(BaseModel):
+    sub: Optional[str] = None  # Keycloak subject ID
     preferred_username: str
     email: Optional[str] = None
     full_name: Optional[str] = None
+    db_user_id: Optional[int] = None  # Database user ID (populated after login)
+    role: Optional[str] = None  # User role name
+
+
+# Group schemas
+class GroupResponse(BaseModel):
+    """Response schema for a single group."""
+    id: int
+    group_name: str
+    hex_color: str
+
+    class Config:
+        from_attributes = True
+
+
+class GroupListResponse(BaseModel):
+    """Response schema for list of groups."""
+    groups: List[GroupResponse]