fix(models): 移除过时的知识库模型，简化数据库结构

src/storage/db/__init__.py

@@ -6,9 +6,6 @@ Base = declarative_base()
 # 导入数据库管理器
 from src.storage.db.manager import db_manager  # noqa: E402
 from src.storage.db.models import (  # noqa: E402, F401
-    KnowledgeDatabase,
-    KnowledgeFile,
-    KnowledgeNode,
     OperationLog,
     User,
 )  # noqa: E402
@@ -17,8 +14,5 @@ __all__ = [
     "Base",
     "User",
     "OperationLog",
-    "KnowledgeDatabase",
-    "KnowledgeFile",
-    "KnowledgeNode",
     "db_manager",
 ]

src/storage/db/models.py

@@ -1,5 +1,4 @@
 import datetime as dt
-import time
 
 from sqlalchemy import JSON, Column, DateTime, ForeignKey, Integer, String, Text
 from sqlalchemy.ext.declarative import declarative_base
@@ -8,109 +7,7 @@ from sqlalchemy.orm import relationship
 Base = declarative_base()
 
 
-class KnowledgeDatabase(Base):
-    """知识库模型"""
-
-    __tablename__ = "knowledge_databases"
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    db_id = Column(String, nullable=False, unique=True, index=True)  # 数据库ID
-    name = Column(String, nullable=False)  # 数据库名称
-    description = Column(Text, nullable=True)  # 描述
-    embed_model = Column(String, nullable=True)  # 嵌入模型名称
-    dimension = Column(Integer, nullable=True)  # 向量维度
-    meta_info = Column(JSON, nullable=True)  # 元数据
-    created_at = Column(DateTime, default=lambda: dt.datetime.now(dt.UTC))  # 创建时间
-
-    # 关系
-    files = relationship("KnowledgeFile", back_populates="database", cascade="all, delete-orphan")
-
-    def to_dict(self, with_nodes=True):
-        """转换为字典格式，确保meta_info映射为metadata"""
-        result = {
-            "id": self.id,
-            "db_id": self.db_id,
-            "name": self.name,
-            "description": self.description,
-            "embed_model": self.embed_model,
-            "dimension": self.dimension,
-            "metadata": self.meta_info or {},
-            "created_at": self.created_at.isoformat() if self.created_at else None,
-        }
-        # 添加文件信息
-        if self.files:
-            result["files"] = {file.file_id: file.to_dict(with_nodes=with_nodes) for file in self.files}
-        else:
-            result["files"] = {}
-        return result
-
-
-class KnowledgeFile(Base):
-    """知识库文件模型"""
-
-    __tablename__ = "knowledge_files"
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    file_id = Column(String, nullable=False, index=True)  # 文件ID
-    database_id = Column(String, ForeignKey("knowledge_databases.db_id"), nullable=False)  # 所属数据库ID
-    filename = Column(String, nullable=False)  # 文件名
-    path = Column(String, nullable=False)  # 文件路径
-    file_type = Column(String, nullable=False)  # 文件类型
-    status = Column(String, nullable=False)  # 处理状态
-    created_at = Column(DateTime, default=lambda: dt.datetime.now(dt.UTC))  # 创建时间
-
-    # 关系
-    database = relationship("KnowledgeDatabase", back_populates="files")
-    nodes = relationship("KnowledgeNode", back_populates="file", cascade="all, delete-orphan")
-
-    @property
-    def computed_node_count(self):
-        """动态计算节点数量"""
-        return len(self.nodes) if self.nodes is not None else 0
-
-    def to_dict(self, with_nodes=True):
-        """转换为字典格式"""
-        result = {
-            "file_id": self.file_id,
-            "filename": self.filename,
-            "path": self.path,
-            "type": self.file_type,
-            "status": self.status,
-            "node_count": self.computed_node_count,
-            "created_at": self.created_at.timestamp() if self.created_at else time.time(),
-        }
-        if with_nodes:
-            result["nodes"] = [node.to_dict() for node in self.nodes] if self.nodes else []
-        return result
-
-
-class KnowledgeNode(Base):
-    """知识块模型"""
-
-    __tablename__ = "knowledge_nodes"
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    file_id = Column(String, ForeignKey("knowledge_files.file_id"), nullable=False)  # 所属文件ID
-    text = Column(Text, nullable=False)  # 文本内容
-    hash = Column(String, nullable=True)  # 文本哈希值
-    start_char_idx = Column(Integer, nullable=True)  # 开始字符索引
-    end_char_idx = Column(Integer, nullable=True)  # 结束字符索引
-    meta_info = Column(JSON, nullable=True)  # 元数据
-
-    # 关系
-    file = relationship("KnowledgeFile", back_populates="nodes")
-
-    def to_dict(self):
-        """转换为字典格式，确保meta_info映射为metadata"""
-        return {
-            "id": self.id,
-            "file_id": self.file_id,
-            "text": self.text,
-            "hash": self.hash,
-            "start_char_idx": self.start_char_idx,
-            "end_char_idx": self.end_char_idx,
-            "metadata": self.meta_info or {},  # 确保映射正确
-        }
+## Removed legacy RDBMS knowledge models (KnowledgeDatabase/KnowledgeFile/KnowledgeNode)
 
 
 class Conversation(Base):