104 lines
5.6 KiB
SQL
104 lines
5.6 KiB
SQL
-- =============================================
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-- Education 模块 — 统一幂等表 DDL (PostgreSQL)
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-- Ticket: 合并 Answer + Submit 幂等表为统一 education_idempotency
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-- Migration: 009
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-- Prerequisites: 002-education-practice-session.sql
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-- =============================================
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-- =============================================
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-- Preconditions
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-- =============================================
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-- Verify table does not already exist:
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-- SELECT COUNT(*) FROM information_schema.tables
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-- WHERE table_catalog = current_database()
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-- AND table_name = 'education_idempotency';
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-- Result MUST be 0 before executing this migration.
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--
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-- NOTE: This table replaces education_answer_idempotency and education_submit_idempotency.
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-- Those tables should be dropped after this migration is verified:
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-- DROP TABLE IF EXISTS education_answer_idempotency;
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-- DROP TABLE IF EXISTS education_submit_idempotency;
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-- =============================================
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-- 统一幂等表
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-- =============================================
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-- Purpose: Unified idempotency store for all education write operations.
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-- operation field distinguishes: SUBMIT_ANSWER vs SUBMIT_SESSION.
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-- Same (tenant, user, operation, idempotency_key) + same request_hash → replay original response.
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-- Same key + different request_hash → conflict.
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-- PostgreSQL ON CONFLICT DO NOTHING resolves concurrent same-key inserts.
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--
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-- Indexes:
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-- uk_idempotency — per-tenant, per-actor, per-operation uniqueness for idempotency key.
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-- Used by: IdempotencyStoreMapper.insertIgnore() ON CONFLICT resolution.
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-- idx_tenant_session — covers lookup by session for audit/debug.
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--
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-- Fields specific to SUBMIT_ANSWER: question_id, selected_answer (nullable for SUBMIT_SESSION).
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-- Fields specific to SUBMIT_SESSION: report_id (nullable for SUBMIT_ANSWER).
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-- response_json: stores serialized response for replay after timeout/retry.
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-- request_hash: SHA-256 of canonical payload for content-based dedup.
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CREATE TABLE education_idempotency (
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id BIGINT GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
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tenant_id BIGINT NOT NULL,
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user_id BIGINT NOT NULL,
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operation VARCHAR(32) NOT NULL,
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idempotency_key VARCHAR(64) NOT NULL,
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request_hash VARCHAR(64) NOT NULL,
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session_id BIGINT NOT NULL,
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question_id VARCHAR(64) DEFAULT NULL,
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selected_answer TEXT DEFAULT NULL,
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report_id BIGINT DEFAULT NULL,
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status VARCHAR(20) NOT NULL DEFAULT 'ACCEPTED',
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response_json TEXT DEFAULT NULL,
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business_payload JSONB DEFAULT NULL,
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creator VARCHAR(64) DEFAULT '',
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create_time TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
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updater VARCHAR(64) DEFAULT '',
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update_time TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
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deleted BOOLEAN NOT NULL DEFAULT false
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);
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COMMENT ON TABLE education_idempotency IS '教育-统一幂等记录（合并 answer + submit）';
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COMMENT ON COLUMN education_idempotency.id IS '主键';
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COMMENT ON COLUMN education_idempotency.tenant_id IS '租户编号';
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COMMENT ON COLUMN education_idempotency.user_id IS '用户编号';
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COMMENT ON COLUMN education_idempotency.operation IS '操作类型：SUBMIT_ANSWER-答题, SUBMIT_SESSION-交卷';
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COMMENT ON COLUMN education_idempotency.idempotency_key IS '客户端幂等键（UUID）';
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COMMENT ON COLUMN education_idempotency.request_hash IS '请求载荷 SHA-256 哈希';
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COMMENT ON COLUMN education_idempotency.session_id IS '会话 ID';
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COMMENT ON COLUMN education_idempotency.question_id IS '题目 ID（SUBMIT_ANSWER）';
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COMMENT ON COLUMN education_idempotency.selected_answer IS '学生已选答案（SUBMIT_ANSWER）';
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COMMENT ON COLUMN education_idempotency.report_id IS '关联报告 ID（SUBMIT_SESSION）';
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COMMENT ON COLUMN education_idempotency.status IS '状态：ACCEPTED-已接受, CONFLICT-冲突';
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COMMENT ON COLUMN education_idempotency.response_json IS '首次成功响应 JSON（用于重试重放）';
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COMMENT ON COLUMN education_idempotency.business_payload IS '业务扩展载荷（JSONB）';
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COMMENT ON COLUMN education_idempotency.creator IS '创建者';
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COMMENT ON COLUMN education_idempotency.create_time IS '创建时间';
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COMMENT ON COLUMN education_idempotency.updater IS '更新者';
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COMMENT ON COLUMN education_idempotency.update_time IS '更新时间';
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COMMENT ON COLUMN education_idempotency.deleted IS '是否删除';
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CREATE UNIQUE INDEX uk_idempotency ON education_idempotency (tenant_id, user_id, operation, idempotency_key);
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CREATE INDEX idx_idempotency_tenant_session ON education_idempotency (tenant_id, session_id);
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-- =============================================
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-- PracticeSessionDO: add review_fingerprint column
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-- =============================================
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-- Purpose: Store canonical fingerprint for wrong-question review session idempotency.
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-- SHA-256 of comma-joined sorted wrong_question IDs for deterministic comparison.
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ALTER TABLE education_practice_session
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ADD COLUMN review_fingerprint VARCHAR(64) DEFAULT NULL;
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COMMENT ON COLUMN education_practice_session.review_fingerprint IS '错题复习指纹（SHA-256），用于幂等创建';
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-- =============================================
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-- Post-migration verification queries
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-- =============================================
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-- Verify new table exists:
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-- \d education_idempotency
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-- Verify unique index:
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-- SELECT * FROM pg_indexes WHERE tablename = 'education_idempotency';
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-- Verify column added:
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-- SELECT column_name, data_type FROM information_schema.columns
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-- WHERE table_name = 'education_practice_session' AND column_name = 'review_fingerprint';
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