feat: 实现父表索引策略，确保仅在父表创建索引，避免子表重复索引维护

openspec/changes/2026-03-03-parent-index-only-partitions/spec.md

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+# Parent-only Index Strategy for Partition Creation
+
+## 1. 背景
+当前 `rcu_action.rcu_action_events` 使用按天 RANGE 分区。
+本次调整目标是明确并固化索引策略：
+- 仅在父表创建索引
+- 分区子表不重复显式创建索引
+
+这样可以避免子表重复索引带来的维护成本和潜在冲突，并保持分区创建逻辑简洁。
+
+## 2. 策略定义
+1. 父表 `rcu_action.rcu_action_events` 作为索引定义唯一来源。
+2. 分区创建只执行 `CREATE TABLE ... PARTITION OF ...`。
+3. 禁止在分区创建流程中追加 `CREATE INDEX` 到子分区。
+4. 索引初始化保持 `IF NOT EXISTS` 幂等语义。
+
+## 3. 实施范围
+- `src/db/partitionManager.js`
+  - 在分区检查流程中显式确保父表索引存在（幂等）。
+  - 创建子分区时仅建分区，不做子表索引创建。
+- `scripts/init_db.sql`
+  - 明确注释：索引仅建父表，子分区不重复建索引。
+
+## 4. 验收标准
+- 分区创建 SQL 不包含任何对子分区的 `CREATE INDEX`。
+- 父表索引可重复执行而不报错（`IF NOT EXISTS`）。
+- 运行初始化和分区预创建后，日志中仅出现父表索引保障与分区建表行为。

openspec/changes/2026-03-03-parent-index-only-partitions/specs/partition-management/spec.md

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+## MODIFIED Requirements
+
+### Requirement: Parent-only index definition for partitioned table
+`rcu_action.rcu_action_events` MUST define and maintain query indexes only on the parent partitioned table, and partition child tables MUST NOT run explicit `CREATE INDEX` statements during partition creation.
+
+#### Scenario: Initialize parent indexes before partition creation
+- **WHEN** the service runs database initialization or scheduled partition pre-creation
+- **THEN** index creation statements are executed only against `rcu_action.rcu_action_events`
+- **AND** statements use `IF NOT EXISTS` to remain idempotent
+
+#### Scenario: Create a new daily child partition
+- **WHEN** a missing partition `rcu_action.rcu_action_events_YYYYMMDD` is created
+- **THEN** the SQL only performs `CREATE TABLE ... PARTITION OF ... FOR VALUES ...`
+- **AND** no child-specific `CREATE INDEX` statement is executed
+
+#### Scenario: Prevent duplicate child index maintenance
+- **WHEN** partition creation runs repeatedly across deployments
+- **THEN** no duplicate child index maintenance logic is introduced in application code
+- **AND** parent-table index strategy remains the single source of truth