# Plan: Enhance PostgreSQL Monitoring

**Track:** Enhance existing database provider for PostgreSQL to support advanced monitoring features.

This plan outlines the steps to enhance the PostgreSQL provider with advanced monitoring capabilities.

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## Phase 1: Foundational Metrics - `pg_stat_activity` and `pg_stat_statements`

### Tasks

-   [~] **Task:** Write tests for `pg_stat_activity` data retrieval.
-   [ ] **Task:** Implement `pg_stat_activity` data retrieval in the PostgreSQL provider.
-   [ ] **Task:** Write tests for `pg_stat_statements` data retrieval.
-   [ ] **Task:** Implement `pg_stat_statements` data retrieval in the PostgreSQL provider.
-   [ ] **Task:** Create a new API endpoint `/api/db/monitoring/postgres/activity` to expose `pg_stat_activity` data.
-   [ ] **Task:** Create a new API endpoint `/api/db/monitoring/postgres/statements` to expose `pg_stat_statements` data.
-   [ ] **Task:** Conductor - User Manual Verification 'Phase 1: Foundational Metrics' (Protocol in workflow.md)

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## Phase 2: Index and Table Analysis

### Tasks

-   [ ] **Task:** Write tests for index usage statistics retrieval.
-   [ ] **Task:** Implement index usage statistics retrieval from `pg_stat_user_indexes` and `pg_stat_user_tables`.
-   [ ] **Task:** Write tests for table and index bloat estimation.
-   [ ] **Task:** Implement table and index bloat estimation queries.
-   [ ] **Task:** Create a new API endpoint `/api/db/monitoring/postgres/indexes` to expose index usage and bloat data.
-   [ ] **Task:** Conductor - User Manual Verification 'Phase 2: Index and Table Analysis' (Protocol in workflow.md)

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## Phase 3: Cache Performance and Finalization

### Tasks

-   [ ] **Task:** Write tests for cache hit rate calculation.
-   [ ] **Task:** Implement cache hit rate calculation for tables and indexes.
-   [ ] **Task:** Create a new API endpoint `/api/db/monitoring/postgres/cache` to expose cache hit rate data.
-   [ ] **Task:** Refactor the monitoring provider to ensure all new functions are cohesive and well-documented.
-   [ ] **Task:** Conductor - User Manual Verification 'Phase 3: Cache Performance and Finalization' (Protocol in workflow.md)
