diff --git a/backend/app/models/models.py b/backend/app/models/models.py
index bcba704..d71d084 100644
--- a/backend/app/models/models.py
+++ b/backend/app/models/models.py
@@ -19,6 +19,7 @@ class User(Base):
     f99_90_id = Column(String(36), primary_key=True, default=generate_uuid)
     user_code = Column(String(10), unique=True, nullable=True, index=True)  # 用户编码
     f99_91_user_id = Column(String(36), unique=True, nullable=False, index=True)
+    # 修正：users表的f99_90_id是varchar
     f01_01_name = Column(String(255), unique=True, nullable=False, index=True)  # username
     email = Column(String(255), unique=True, nullable=True, index=True)
     phone = Column(String(50), nullable=True)
@@ -58,6 +59,7 @@ class Collection(Base):
     # f99 系统字段
     f99_90_id = Column(String(36), primary_key=True, default=generate_uuid)
     f99_91_user_id = Column(String(36), ForeignKey("users.f99_90_id", ondelete="CASCADE"), nullable=False, index=True)
+    # 修正：users表的f99_90_id是varchar
     f99_92_created_at = Column(DateTime(timezone=True), server_default=func.now(), index=True)
     f99_93_updated_at = Column(DateTime(timezone=True), onupdate=func.now())
 
@@ -123,7 +125,9 @@ class Operation(Base):
 
     f99_90_id = Column(String(36), primary_key=True, default=generate_uuid)
     f99_91_user_id = Column(String(36), ForeignKey("collections.f99_90_id", ondelete="CASCADE"), nullable=False, index=True)
+    # 修正：users表的f99_90_id是varchar
     f99_92_user_id = Column(String(36), ForeignKey("users.f99_90_id", ondelete="CASCADE"), nullable=False, index=True)
+    # 修正：users表的f99_90_id是varchar
     type = Column(String(50), nullable=False, index=True)
     price = Column(Float, nullable=True)
     note = Column(Text, nullable=True)
@@ -138,6 +142,7 @@ class CustomField(Base):
 
     id = Column(String(36), primary_key=True, default=generate_uuid)
     user_id = Column(String(36), ForeignKey("users.f99_90_id", ondelete="CASCADE"), nullable=False, index=True)
+    # 修正：users表的f99_90_id是varchar
     name = Column(String(100), nullable=False)
     field_type = Column(String(50), default="text")
     options = Column(Text, nullable=True)
@@ -155,6 +160,7 @@ class Information(Base):
 
     id = Column(String(36), primary_key=True, default=generate_uuid)
     user_id = Column(String(36), ForeignKey("users.f99_90_id", ondelete="CASCADE"), nullable=False, index=True)
+    # 修正：users表的f99_90_id是varchar
     
     # 信息类型: seek-寻配号, deal-成交数据, publish-发布
     info_type = Column(String(20), nullable=False, index=True)
@@ -188,6 +194,7 @@ class Information(Base):
     
     # 匹配的用户ID（当用户愿意交换联系方式时）
     matched_user_id = Column(String(36), ForeignKey("users.f99_90_id", ondelete="SET NULL"), nullable=True)
+    # 修正：users表的f99_90_id是varchar
     
     # 匹配者的联系方式（只有发布者和匹配者可见）
     matched_contact = Column(String(100), nullable=True)
@@ -210,6 +217,7 @@ class InformationComment(Base):
     id = Column(String(36), primary_key=True, default=generate_uuid)
     information_id = Column(String(36), ForeignKey("information.id", ondelete="CASCADE"), nullable=False, index=True)
     user_id = Column(String(36), ForeignKey("users.f99_90_id", ondelete="CASCADE"), nullable=False, index=True)
+    # 修正：users表的f99_90_id是varchar
     content = Column(Text, nullable=False)
     created_at = Column(DateTime(timezone=True), server_default=func.now())
 
@@ -235,6 +243,7 @@ class InformationLike(Base):
     id = Column(String(36), primary_key=True, default=generate_uuid)
     information_id = Column(String(36), ForeignKey("information.id", ondelete="CASCADE"), nullable=False, index=True)
     user_id = Column(String(36), ForeignKey("users.f99_90_id", ondelete="CASCADE"), nullable=False, index=True)
+    # 修正：users表的f99_90_id是varchar
     created_at = Column(DateTime(timezone=True), server_default=func.now())
 
     __table_args__ = (
@@ -262,7 +271,9 @@ class UserFeedback(Base):
     __tablename__ = "user_feedbacks"
     
     id = Column(Integer, primary_key=True, index=True)
-    user_id = Column(Integer, ForeignKey("users.f99_90_id"), nullable=False)
+    ForeignKey("users.f99_90_id"), nullable=False)
+    user_id = Column(String, ForeignKey("users.f99_90_id"), nullable=False)
+    # 修正：users表的f99_90_id是varchar
     content = Column(Text, nullable=False)
     contact = Column(String(100), default="")
     status = Column(String(20), default="pending")  # pending, resolved