Phase C5: Storage Quota - user/membership tier quota management

backend/python/app/models.py

@@ -486,6 +486,7 @@ class AIModel(Base):
     id = Column(String(36), primary_key=True, default=gen_uuid)
     provider_id = Column(String(36), ForeignKey("model_providers.id"), nullable=False)
     name = Column(String(100), nullable=False)
+    display_name = Column(String(200), default=None, comment="display name")
     api_key = Column(String(255), default=None)
     endpoint = Column(String(500), default=None)
     capabilities = Column(JSON, default=None)
@@ -1004,6 +1005,22 @@ class OSSStorageConfig(Base):
     created_at = Column(DateTime, default=datetime.now)
     updated_at = Column(DateTime, default=datetime.now, onupdate=datetime.now)
 
+
+
+class UserStorageQuota(Base):
+    __tablename__ = "user_storage_quotas"
+
+    id = Column(String(36), primary_key=True, default=gen_uuid)
+    user_id = Column(String(36), nullable=False, unique=True)
+    quota_bytes = Column(BigInteger, nullable=False, default=1073741824)
+    used_bytes = Column(BigInteger, nullable=False, default=0)
+    quota_type = Column(String(20), nullable=False, default="membership")
+    membership_level = Column(Integer, default=0)
+    plan_id = Column(String(36), default=None)
+    created_at = Column(DateTime, default=datetime.now)
+    updated_at = Column(DateTime, default=datetime.now, onupdate=datetime.now)
+
+
 class AutomatedTask(Base):
     __tablename__ = "automated_tasks"