feat(approval): 审批单内容快照与二次分配方案版本化

补齐 code-review 遗留 2 项：审批单此前只固化 ref_id/refer_no 指针，复核者看到的是业务当前内容；二次分配方案在编辑替换与驳回清空时一律物理删除，方案事实无处回溯。 - 审批单加 version_no 与 snapshot_json（信封 schema_version/order_type/ captured_at/data）；二次分配、月结、调整单三类提交均固化送审内容，开关关闭的自动通过路径同样写快照；详情按 snapshot/live/missing 三态回显，历史单只读回退当前内容并显式告警，不回填历史快照 - 二次分配方案行改 append-only 版本化（version_no/is_active，唯一键扩为 business+version+personnel）：编辑替换与驳回清空只置历史，核算与详情默认只取生效行，业务详情新增 allocation_history - 送审内容未变不重提、方案未变不新增版本：判据统一为送审内容，两个 version_no 语义解耦（方案版本=内容第几版，审批单版本=第几次送审） - 审批单列表、工作台待办、审批超时预警三处 defer 快照列，避免整列拉取 - 月结提交取行加 for_update，防并发提交算出重复的审批单版本号 - 修复审批类型筛选上界 le=2（调整单无法筛选）、快照金额把空值写成 0.00 - V11 迁移三件套同步（Alembic / db/migration / init-dev.sql）测试：单元 +16（方案内容比较 10、审批入参 6）、集成 +12；全量 891 passed。 Co-Authored-By: Claude Code <noreply@anthropic.com>
2026-10-20 18:30:51 +08:00
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+"""v11 审批快照与方案版本化
+
+Revision ID: f3a8c2d61b47
+Revises: 90653814a421
+Create Date: 2026-10-20 10:30:00.000000
+
+补齐 code-review 遗留 2 项：
+
+- 审批单加 ``version_no`` 与 ``snapshot_json``：重提产生新版本，送审内容
+  在提交时固化，审批期间业务再改不影响复核依据；
+- 二次分配方案行改 append-only 版本化：加 ``version_no`` / ``is_active``，
+  唯一键由 (business_id, personnel_id) 扩为
+  (business_id, version_no, personnel_id)，编辑替换与驳回清空只置历史、
+  不再物理删除。
+
+存量数据均落 ``version_no=1`` / ``is_active=1``：升级前的行就是当前生效
+版本，语义不变。审批单存量快照为空，详情接口按「当前内容回退 + 显式
+标注」处理，不做历史回填（回填会伪造提交时内容）。
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "f3a8c2d61b47"
+down_revision: str | Sequence[str] | None = "90653814a421"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    """加审批快照列/索引与方案版本列，替换唯一键。"""
+    op.execute(
+        "ALTER TABLE approval_orders "
+        "ADD COLUMN version_no INT NOT NULL DEFAULT 1 "
+        "COMMENT '提交版本号（同一对象类型+引用对象从1递增；重提产生新版本，旧单快照不覆盖）' "
+        "AFTER refer_no"
+    )
+    op.execute(
+        "ALTER TABLE approval_orders "
+        "ADD COLUMN snapshot_json JSON NULL "
+        "COMMENT '提交时内容快照（信封：schema_version/order_type/captured_at/data；历史单可空）' "
+        "AFTER version_no"
+    )
+    op.execute(
+        "CREATE INDEX idx_approval_orders_type_ref ON approval_orders (order_type, ref_id)"
+    )
+
+    op.execute(
+        "ALTER TABLE business_secondary_allocations "
+        "ADD COLUMN version_no INT NOT NULL DEFAULT 1 "
+        "COMMENT '方案版本号（同一业务从1递增；编辑/重提产生新版本，旧版本仅置历史）' "
+        "AFTER business_id"
+    )
+    op.execute(
+        "ALTER TABLE business_secondary_allocations "
+        "ADD COLUMN is_active TINYINT NOT NULL DEFAULT 1 "
+        "COMMENT '是否当前生效版本：1生效 0历史（编辑替换/驳回清空后置0，行不删除）' "
+        "AFTER ratio"
+    )
+    op.execute(
+        "ALTER TABLE business_secondary_allocations "
+        "DROP INDEX uk_business_secondary_allocations_business_personnel, "
+        "ADD CONSTRAINT uk_business_secondary_allocations_business_version_personnel "
+        "UNIQUE (business_id, version_no, personnel_id)"
+    )
+    op.execute(
+        "CREATE INDEX idx_business_secondary_allocations_business_active "
+        "ON business_secondary_allocations (business_id, is_active)"
+    )
+    op.execute(
+        "ALTER TABLE business_secondary_allocations COMMENT = "
+        "'业务二次分配方案版本表（append-only；比例不要求合计满额，余额归属待澄清）'"
+    )
+
+
+def downgrade() -> None:
+    """回退结构（降级前须确认同业务同一参与人只存在于一个版本）。"""
+    op.execute(
+        "DROP INDEX idx_business_secondary_allocations_business_active "
+        "ON business_secondary_allocations"
+    )
+    op.execute(
+        "ALTER TABLE business_secondary_allocations "
+        "DROP INDEX uk_business_secondary_allocations_business_version_personnel, "
+        "ADD CONSTRAINT uk_business_secondary_allocations_business_personnel "
+        "UNIQUE (business_id, personnel_id)"
+    )
+    op.execute("ALTER TABLE business_secondary_allocations DROP COLUMN is_active")
+    op.execute("ALTER TABLE business_secondary_allocations DROP COLUMN version_no")
+
+    op.execute("DROP INDEX idx_approval_orders_type_ref ON approval_orders")
+    op.execute("ALTER TABLE approval_orders DROP COLUMN snapshot_json")
+    op.execute("ALTER TABLE approval_orders DROP COLUMN version_no")