47 lines
1.7 KiB
Python
47 lines
1.7 KiB
Python
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"""Add the conversation table already specified by docs/02 section 8.1.
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Only CREATE TABLE; existing tables and columns are unchanged.
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"""
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from alembic import op
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revision = "20260909_session"
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down_revision = "20260909_outbox_delivery"
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branch_labels = None
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depends_on = None
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SESSION_DDL = """CREATE TABLE svc_conversation_session (
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id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
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session_id VARCHAR(64) NOT NULL,
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user_id BIGINT UNSIGNED NOT NULL,
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portal VARCHAR(32) NOT NULL,
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agent_type VARCHAR(32) NULL,
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status VARCHAR(16) NOT NULL DEFAULT 'active',
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clarification_round TINYINT UNSIGNED NOT NULL DEFAULT 0,
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message_count INT UNSIGNED NOT NULL DEFAULT 0,
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last_intent VARCHAR(32) NULL,
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config_version VARCHAR(64) NULL,
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started_at DATETIME(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6),
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last_active_at DATETIME(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6),
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ended_at DATETIME(6) NULL,
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created_at DATETIME(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6),
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updated_at DATETIME(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6)
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ON UPDATE CURRENT_TIMESTAMP(6),
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PRIMARY KEY (id),
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UNIQUE KEY uk_session_id (session_id),
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KEY idx_session_user_active (user_id, last_active_at),
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KEY idx_session_status_active (status, last_active_at),
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CONSTRAINT fk_session_user FOREIGN KEY (user_id) REFERENCES sys_user(id),
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CONSTRAINT chk_session_status
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CHECK (status IN ('active', 'ended', 'transferred', 'expired')),
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CONSTRAINT chk_session_clarification CHECK (clarification_round <= 10)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
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COMMENT='Agent会话状态与澄清轮次';"""
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def upgrade() -> None:
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op.execute(SESSION_DDL)
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def downgrade() -> None:
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raise RuntimeError("会话数据禁止自动删除，请使用受控的前向兼容迁移")
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