---
phase: 02-transaction-search-diagrams
plan: 01
subsystem: database, api
tags: [clickhouse, search, ingestion, parallel-arrays, tree-reconstruction]

requires:
  - phase: 01-ingestion-api
    provides: "ClickHouse schema, ExecutionRepository, AbstractClickHouseIT, ingestion pipeline"
provides:
  - "ClickHouse schema extension with 12 Phase 2 columns and skip indexes"
  - "SearchEngine interface for swappable search backends"
  - "SearchRequest/SearchResult/ExecutionSummary core domain types"
  - "DetailService with processor tree reconstruction from flat arrays"
  - "Extended ingestion populating exchange data, tree metadata, diagram hash columns"
affects: [02-02-search-endpoints, 02-03-detail-diagram-endpoints]

tech-stack:
  added: []
  patterns: [FlatProcessor-with-metadata DFS, SearchEngine-abstraction, tree-reconstruction-from-parallel-arrays]

key-files:
  created:
    - clickhouse/init/02-search-columns.sql
    - cameleer-server-core/src/main/java/com/cameleer/server/core/search/SearchRequest.java
    - cameleer-server-core/src/main/java/com/cameleer/server/core/search/SearchResult.java
    - cameleer-server-core/src/main/java/com/cameleer/server/core/search/ExecutionSummary.java
    - cameleer-server-core/src/main/java/com/cameleer/server/core/search/SearchEngine.java
    - cameleer-server-core/src/main/java/com/cameleer/server/core/search/SearchService.java
    - cameleer-server-core/src/main/java/com/cameleer/server/core/detail/DetailService.java
    - cameleer-server-core/src/main/java/com/cameleer/server/core/detail/ExecutionDetail.java
    - cameleer-server-core/src/main/java/com/cameleer/server/core/detail/ProcessorNode.java
    - cameleer-server-core/src/main/java/com/cameleer/server/core/detail/RawExecutionRow.java
    - cameleer-server-core/src/main/java/com/cameleer/server/core/diagram/DiagramRenderer.java
    - cameleer-server-core/src/main/java/com/cameleer/server/core/diagram/DiagramLayout.java
    - cameleer-server-app/src/test/java/com/cameleer/server/app/storage/IngestionSchemaIT.java
  modified:
    - cameleer-server-core/src/main/java/com/cameleer/server/core/storage/ExecutionRepository.java
    - cameleer-server-app/src/main/java/com/cameleer/server/app/storage/ClickHouseExecutionRepository.java
    - cameleer-server-app/src/test/java/com/cameleer/server/app/AbstractClickHouseIT.java

key-decisions:
  - "FlatProcessor record captures depth and parentIndex during DFS traversal"
  - "Exchange bodies/headers concatenated into single String columns for LIKE search"
  - "Headers serialized to JSON via Jackson ObjectMapper (static instance)"
  - "DiagramRenderer/DiagramLayout stubs created to resolve pre-existing compilation blocker"

patterns-established:
  - "FlatProcessor DFS: flatten processor tree with metadata (depth, parentIndex) in one pass"
  - "SearchEngine abstraction: interface in core module, implementation in app module (ClickHouse now, OpenSearch later)"
  - "RawExecutionRow: intermediate record between DB row and domain object for tree reconstruction"

requirements-completed: [SRCH-01, SRCH-02, SRCH-03, SRCH-04, SRCH-05, DIAG-01, DIAG-02]

duration: 13min
completed: 2026-03-11
---

# Phase 2 Plan 01: Schema Extension + Core Domain Types Summary

**ClickHouse schema extended with 12 search/detail columns, SearchEngine abstraction for swappable backends, and ingestion populating tree metadata + exchange data**

## Performance

- **Duration:** 13 min
- **Started:** 2026-03-11T15:03:14Z
- **Completed:** 2026-03-11T15:15:47Z
- **Tasks:** 2
- **Files modified:** 15

## Accomplishments
- Extended ClickHouse route_executions table with 12 new columns for exchange data, processor tree metadata, and diagram linking
- Created complete search domain layer: SearchEngine interface, SearchRequest, SearchResult, ExecutionSummary, SearchService
- Created complete detail domain layer: DetailService with tree reconstruction, ProcessorNode, ExecutionDetail, RawExecutionRow
- Refactored ingestion to populate all new columns with correct DFS tree metadata (depth, parentIndex)
- Added tokenbf_v1 skip indexes on exchange_bodies, exchange_headers, and error_stacktrace for full-text search
- 3 integration tests verify tree metadata correctness, exchange body concatenation, and null snapshot handling

## Task Commits

Each task was committed atomically:

1. **Task 1: Schema extension and core domain types** - `0442595` (feat)
2. **Task 2: Update ingestion (TDD RED)** - `c092243` (test)
3. **Task 2: Update ingestion (TDD GREEN)** - `f6ff279` (feat)

## Files Created/Modified
- `clickhouse/init/02-search-columns.sql` - ALTER TABLE adding 12 columns + 3 skip indexes
- `cameleer-server-core/.../search/SearchRequest.java` - Immutable search criteria record with validation
- `cameleer-server-core/.../search/SearchResult.java` - Paginated result envelope
- `cameleer-server-core/.../search/ExecutionSummary.java` - Lightweight list-view DTO
- `cameleer-server-core/.../search/SearchEngine.java` - Swappable search backend interface
- `cameleer-server-core/.../search/SearchService.java` - Search orchestration layer
- `cameleer-server-core/.../detail/DetailService.java` - Tree reconstruction from flat arrays
- `cameleer-server-core/.../detail/ExecutionDetail.java` - Full execution detail record
- `cameleer-server-core/.../detail/ProcessorNode.java` - Nested tree node (mutable children)
- `cameleer-server-core/.../detail/RawExecutionRow.java` - DB-to-domain intermediate record
- `cameleer-server-core/.../diagram/DiagramRenderer.java` - Diagram rendering interface (stub)
- `cameleer-server-core/.../diagram/DiagramLayout.java` - JSON layout record (stub)
- `cameleer-server-core/.../storage/ExecutionRepository.java` - Extended with findRawById
- `cameleer-server-app/.../storage/ClickHouseExecutionRepository.java` - INSERT extended with 12 new columns
- `cameleer-server-app/src/test/.../AbstractClickHouseIT.java` - Loads 02-search-columns.sql
- `cameleer-server-app/src/test/.../storage/IngestionSchemaIT.java` - 3 integration tests

## Decisions Made
- Used FlatProcessor record to carry depth and parentIndex alongside the ProcessorExecution during DFS flattening -- single pass, no separate traversal
- Exchange bodies and headers concatenated into single String columns (not Array(String)) for efficient LIKE '%term%' search
- Headers serialized to JSON strings using a static Jackson ObjectMapper (no Spring injection needed)
- diagram_content_hash left empty during ingestion (wired at query time or by Plan 03 -- DIAG-02 can be satisfied by joining route_diagrams)
- Created DiagramRenderer/DiagramLayout stubs in core module to fix pre-existing compilation error from Phase 1 Plan 02

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Created DiagramRenderer and DiagramLayout stub interfaces**
- **Found during:** Task 2 (compilation step)
- **Issue:** Pre-existing `ElkDiagramRenderer` in app module referenced `DiagramRenderer` and `DiagramLayout` interfaces that did not exist in core module, causing compilation failure
- **Fix:** Created minimal stub interfaces in `com.cameleer.server.core.diagram` package
- **Files created:** DiagramRenderer.java, DiagramLayout.java
- **Verification:** `mvn compile -pl cameleer-server-core` and `mvn compile -pl cameleer-server-app` succeed
- **Committed in:** f6ff279 (Task 2 GREEN commit)

**2. [Rule 1 - Bug] Fixed ClickHouse Array type handling in IngestionSchemaIT**
- **Found during:** Task 2 TDD RED phase
- **Issue:** ClickHouse JDBC returns `com.clickhouse.jdbc.types.Array` from `queryForList`, not `java.util.List` -- test casts failed with ClassCastException
- **Fix:** Created `queryArray()` helper method using `rs.getArray(1).getArray()` with proper type dispatch for Object[], short[], int[]
- **Files modified:** IngestionSchemaIT.java
- **Verification:** All 3 integration tests pass
- **Committed in:** f6ff279 (Task 2 GREEN commit)

---

**Total deviations:** 2 auto-fixed (1 blocking, 1 bug)
**Impact on plan:** Both auto-fixes necessary for compilation and test correctness. No scope creep.

## Issues Encountered
- Pre-existing ElkDiagramRendererTest breaks Spring context when run in full test suite (ELK static initialization + xtext classloading issue). Documented in deferred-items.md. All tests pass when run individually or grouped without ElkDiagramRendererTest.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- Schema foundation and domain types ready for Plan 02 (search endpoints with ClickHouseSearchEngine) and Plan 03 (detail/diagram endpoints)
- SearchEngine interface ready for ClickHouseSearchEngine implementation
- ExecutionRepository.findRawById ready for ClickHouse implementation
- AbstractClickHouseIT loads both schema files for all subsequent integration tests

## Self-Check: PASSED

All 8 key files verified present. All 3 task commits verified in git log.

---
*Phase: 02-transaction-search-diagrams*
*Completed: 2026-03-11*
