feat: persist agent chat history

database/versions/8ab72c49d1e3_2_2_10.py

@@ -0,0 +1,73 @@
+"""2.2.10
+新增 Agent 会话历史表
+
+Revision ID: 8ab72c49d1e3
+Revises: 7c1a2b3d4e5f
+Create Date: 2026-06-18
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+revision = "8ab72c49d1e3"
+down_revision = "7c1a2b3d4e5f"
+branch_labels = None
+depends_on = None
+
+
+def _has_table(inspector: sa.Inspector, table_name: str) -> bool:
+    """检查数据表是否已存在。"""
+    return table_name in inspector.get_table_names()
+
+
+def upgrade() -> None:
+    """升级数据库结构。"""
+    inspector = sa.inspect(op.get_bind())
+    if _has_table(inspector, "agentchat"):
+        return
+
+    op.create_table(
+        "agentchat",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("session_id", sa.String(), nullable=False),
+        sa.Column("client_session_id", sa.String(), nullable=True),
+        sa.Column("user_id", sa.String(), nullable=True),
+        sa.Column("username", sa.String(), nullable=True),
+        sa.Column("channel", sa.String(), nullable=True),
+        sa.Column("source", sa.String(), nullable=True),
+        sa.Column("original_chat_id", sa.String(), nullable=True),
+        sa.Column("title", sa.String(), nullable=True),
+        sa.Column("preview", sa.String(), nullable=True),
+        sa.Column("agent_messages", sa.JSON(), nullable=True),
+        sa.Column("display_messages", sa.JSON(), nullable=True),
+        sa.Column("message_count", sa.Integer(), nullable=True),
+        sa.Column("created_at", sa.String(), nullable=True),
+        sa.Column("updated_at", sa.String(), nullable=True),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(
+        "ix_agentchat_session_user",
+        "agentchat",
+        ["session_id", "user_id"],
+    )
+    op.create_index(
+        "ix_agentchat_user_updated",
+        "agentchat",
+        ["user_id", "updated_at", "id"],
+    )
+    op.create_index(
+        "ix_agentchat_channel_updated",
+        "agentchat",
+        ["channel", "updated_at", "id"],
+    )
+
+
+def downgrade() -> None:
+    """回滚数据库结构。"""
+    inspector = sa.inspect(op.get_bind())
+    if not _has_table(inspector, "agentchat"):
+        return
+    op.drop_index("ix_agentchat_channel_updated", table_name="agentchat")
+    op.drop_index("ix_agentchat_user_updated", table_name="agentchat")
+    op.drop_index("ix_agentchat_session_user", table_name="agentchat")
+    op.drop_table("agentchat")