feat(api/workflow): Add Conversation.dialogue_count (#7275)

api/models/model.py

@@ -7,6 +7,7 @@ from typing import Optional
 from flask import request
 from flask_login import UserMixin
 from sqlalchemy import Float, func, text
+from sqlalchemy.orm import Mapped, mapped_column
 
 from configs import dify_config
 from core.file.tool_file_parser import ToolFileParser
@@ -512,12 +513,12 @@ class Conversation(db.Model):
     from_account_id = db.Column(StringUUID)
     read_at = db.Column(db.DateTime)
     read_account_id = db.Column(StringUUID)
+    dialogue_count: Mapped[int] = mapped_column(default=0)
     created_at = db.Column(db.DateTime, nullable=False, server_default=db.text('CURRENT_TIMESTAMP(0)'))
     updated_at = db.Column(db.DateTime, nullable=False, server_default=db.text('CURRENT_TIMESTAMP(0)'))
 
     messages = db.relationship("Message", backref="conversation", lazy='select', passive_deletes="all")
-    message_annotations = db.relationship("MessageAnnotation", backref="conversation", lazy='select',
-                                          passive_deletes="all")
+    message_annotations = db.relationship("MessageAnnotation", backref="conversation", lazy='select', passive_deletes="all")
 
     is_deleted = db.Column(db.Boolean, nullable=False, server_default=db.text('false'))