M2b：删除旧 chat 体系——线性会话/叩心/情绪/纪念日模型与页面退役（迁移 003 双向验证），runs 去会话外键，测试全量修剪

2026-08-21 23:43:31 +08:00
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+"""退役旧会话模型：删除 chat/情绪/纪念日表与 runs 旧会话外键
+
+Revision ID: 003
+Revises: 002
+Create Date: 2026-08-21 23:17:17.055812
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '003'
+down_revision: Union[str, Sequence[str], None] = '002'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # 顺序约束：先去掉 runs.session_id（batch 反射 runs 外键时 chat_sessions 须仍存在），
+    # 再删除旧会话相关表；SQLite 下 batch 自动处理索引与无名外键。
+    op.drop_index('ix_runs_session_id', table_name='runs')
+    with op.batch_alter_table('runs') as batch_op:
+        batch_op.drop_column('session_id')
+    op.drop_table('character_emotion_states')
+    op.drop_index(op.f('ix_chat_sessions_character_id'), table_name='chat_sessions')
+    op.drop_index(op.f('ix_chat_sessions_owner_scope'), table_name='chat_sessions')
+    op.drop_index(op.f('ix_chat_sessions_status'), table_name='chat_sessions')
+    op.drop_table('chat_sessions')
+    op.drop_index(op.f('ix_chat_messages_character_id'), table_name='chat_messages')
+    op.drop_index(op.f('ix_chat_messages_run_id'), table_name='chat_messages')
+    op.drop_index(op.f('ix_chat_messages_session_id'), table_name='chat_messages')
+    op.drop_table('chat_messages')
+    op.drop_index(op.f('ix_time_anniversaries_character_id'), table_name='time_anniversaries')
+    op.drop_table('time_anniversaries')
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    # 先重建 chat 表，再经 batch 恢复 runs.session_id 列与外键（SQLite 安全）
+    op.create_table('time_anniversaries',
+    sa.Column('id', sa.VARCHAR(length=80), nullable=False),
+    sa.Column('character_id', sa.VARCHAR(length=80), nullable=False),
+    sa.Column('name', sa.VARCHAR(length=200), nullable=False),
+    sa.Column('calendar', sa.VARCHAR(length=20), nullable=False),
+    sa.Column('date', sa.VARCHAR(length=20), nullable=False),
+    sa.Column('recurs_yearly', sa.BOOLEAN(), nullable=False),
+    sa.Column('kind', sa.VARCHAR(length=40), nullable=False),
+    sa.Column('subject_type', sa.VARCHAR(length=40), nullable=False),
+    sa.Column('source', sa.VARCHAR(length=40), nullable=False),
+    sa.Column('metadata_json', sa.TEXT(), nullable=False),
+    sa.Column('created_at', sa.DATETIME(), nullable=False),
+    sa.Column('updated_at', sa.DATETIME(), nullable=False),
+    sa.ForeignKeyConstraint(['character_id'], ['characters.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_time_anniversaries_character_id'), 'time_anniversaries', ['character_id'], unique=False)
+    op.create_table('chat_messages',
+    sa.Column('id', sa.VARCHAR(length=80), nullable=False),
+    sa.Column('character_id', sa.VARCHAR(length=80), nullable=False),
+    sa.Column('session_id', sa.VARCHAR(length=80), nullable=False),
+    sa.Column('role', sa.VARCHAR(length=40), nullable=False),
+    sa.Column('content', sa.TEXT(), nullable=False),
+    sa.Column('modality', sa.VARCHAR(length=40), nullable=False),
+    sa.Column('run_id', sa.VARCHAR(length=80), nullable=True),
+    sa.Column('metadata_json', sa.TEXT(), nullable=False),
+    sa.Column('sensitivity', sa.VARCHAR(length=40), nullable=False),
+    sa.Column('versions_json', sa.TEXT(), nullable=False),
+    sa.Column('active_version_idx', sa.INTEGER(), nullable=False),
+    sa.Column('created_at', sa.DATETIME(), nullable=False),
+    sa.Column('deleted_at', sa.DATETIME(), nullable=True),
+    sa.ForeignKeyConstraint(['character_id'], ['characters.id'], ),
+    sa.ForeignKeyConstraint(['run_id'], ['runs.id'], ),
+    sa.ForeignKeyConstraint(['session_id'], ['chat_sessions.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_chat_messages_session_id'), 'chat_messages', ['session_id'], unique=False)
+    op.create_index(op.f('ix_chat_messages_run_id'), 'chat_messages', ['run_id'], unique=False)
+    op.create_index(op.f('ix_chat_messages_character_id'), 'chat_messages', ['character_id'], unique=False)
+    op.create_table('chat_sessions',
+    sa.Column('id', sa.VARCHAR(length=80), nullable=False),
+    sa.Column('character_id', sa.VARCHAR(length=80), nullable=False),
+    sa.Column('title', sa.VARCHAR(length=200), nullable=True),
+    sa.Column('status', sa.VARCHAR(length=40), nullable=False),
+    sa.Column('owner_scope', sa.VARCHAR(length=80), nullable=False),
+    sa.Column('created_at', sa.DATETIME(), nullable=False),
+    sa.Column('updated_at', sa.DATETIME(), nullable=False),
+    sa.ForeignKeyConstraint(['character_id'], ['characters.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_chat_sessions_status'), 'chat_sessions', ['status'], unique=False)
+    op.create_index(op.f('ix_chat_sessions_owner_scope'), 'chat_sessions', ['owner_scope'], unique=False)
+    op.create_index(op.f('ix_chat_sessions_character_id'), 'chat_sessions', ['character_id'], unique=False)
+    op.create_table('character_emotion_states',
+    sa.Column('character_id', sa.VARCHAR(length=80), nullable=False),
+    sa.Column('mood', sa.VARCHAR(length=40), nullable=False),
+    sa.Column('intensity', sa.FLOAT(), nullable=False),
+    sa.Column('baseline_mood', sa.VARCHAR(length=40), nullable=False),
+    sa.Column('baseline_intensity', sa.FLOAT(), nullable=False),
+    sa.Column('updated_at', sa.DATETIME(), nullable=False),
+    sa.Column('last_trigger_event_id', sa.VARCHAR(length=80), nullable=True),
+    sa.ForeignKeyConstraint(['character_id'], ['characters.id'], ),
+    sa.PrimaryKeyConstraint('character_id')
+    )
+    with op.batch_alter_table('runs') as batch_op:
+        batch_op.add_column(sa.Column('session_id', sa.String(length=80), nullable=True))
+        batch_op.create_foreign_key('fk_runs_session_id', 'chat_sessions', ['session_id'], ['id'])
+        batch_op.create_index('ix_runs_session_id', ['session_id'])
+    # ### end Alembic commands ###