feat(chat): 单向聊天可二次激活 单向聊天可二次激活，未删除方聊天消息保留，双向删除后记录清空

alembic/versions/43b2d2efe0f7_merage_chat_participant_and_read_status.py

@@ -0,0 +1,52 @@
+"""merage chat_participant and read_status
+
+Revision ID: 43b2d2efe0f7
+Revises: e9466c397aa2
+Create Date: 2025-05-16 22:20:04.592819
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import mysql
+
+# revision identifiers, used by Alembic.
+revision: str = '43b2d2efe0f7'
+down_revision: Union[str, None] = 'e9466c397aa2'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index('idx_read_status_on_chat_id', table_name='system_read_status')
+    op.drop_index('idx_read_status_on_user_id', table_name='system_read_status')
+    op.drop_table('system_read_status')
+    op.add_column('system_chat_participant', sa.Column('last_read_message_id', sa.Integer(), nullable=True))
+    op.add_column('system_chat_participant', sa.Column('last_del_message_id', sa.Integer(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('system_chat_participant', 'last_del_message_id')
+    op.drop_column('system_chat_participant', 'last_read_message_id')
+    op.create_table('system_read_status',
+    sa.Column('last_read_message_id', mysql.INTEGER(display_width=11), autoincrement=False, nullable=True),
+    sa.Column('user_id', mysql.INTEGER(display_width=11), autoincrement=False, nullable=False),
+    sa.Column('chat_id', mysql.INTEGER(display_width=11), autoincrement=False, nullable=False),
+    sa.Column('id', mysql.INTEGER(display_width=11), autoincrement=True, nullable=False, comment='自增id'),
+    sa.Column('created_at', mysql.DATETIME(), server_default=sa.text('CURRENT_TIMESTAMP'), nullable=False, comment='创建时间'),
+    sa.Column('updated_at', mysql.DATETIME(), server_default=sa.text('CURRENT_TIMESTAMP'), nullable=False, comment='更新时间'),
+    sa.ForeignKeyConstraint(['chat_id'], ['system_chats.id'], name='system_read_status_ibfk_1'),
+    sa.ForeignKeyConstraint(['user_id'], ['system_users.user_id'], name='system_read_status_ibfk_2'),
+    sa.PrimaryKeyConstraint('id'),
+    comment='聊天消息读取状态表',
+    mysql_comment='聊天消息读取状态表',
+    mysql_default_charset='utf8mb4',
+    mysql_engine='InnoDB'
+    )
+    op.create_index('idx_read_status_on_user_id', 'system_read_status', ['user_id'], unique=False)
+    op.create_index('idx_read_status_on_chat_id', 'system_read_status', ['chat_id'], unique=False)
+    # ### end Alembic commands ###