---
phase: 09-batch-operations
plan: 02
subsystem: bot
tags: [n8n, telegram, batch, loop, progress, docker]

# Dependency graph
requires:
  - phase: 09-01
    provides: Batch command parsing with container matching and Route Batch Action
provides:
  - Sequential batch execution with Loop Over Items pattern
  - Per-container progress updates via Telegram editMessageText
  - Error isolation (one failure does not abort batch)
  - Failure-emphasized summary with Back to List navigation
affects: [09-03, 10-polish]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - splitInBatches node for sequential execution
    - Two-phase action execution (lookup then execute)
    - Progress message editing during long operations

key-files:
  created: []
  modified:
    - n8n-workflow.json

key-decisions:
  - "Container lookup for callbacks without Id - use filters API"
  - "Two-phase execution - lookup then action for name-only containers"
  - "Progress edit every container - batch sizes typically 2-5"
  - "Warnings shown in detail for <= 3, summary for > 3"
  - "Is Batch Complete IF node routes to summary vs loop continuation"

patterns-established:
  - "Loop with isComplete check for summary timing"
  - "onError: continueRegularOutput for non-aborting execution"
  - "Result aggregation via passed state (results array, counters)"

# Metrics
duration: 7min
completed: 2026-02-04
---

# Phase 9 Plan 02: Batch Execution and Progress Summary

**Sequential batch execution with Loop Over Items, per-container progress edits, error isolation, and failure-emphasized summaries**

## Performance

- **Duration:** 7 min
- **Started:** 2026-02-04T02:26:37Z
- **Completed:** 2026-02-04T02:33:47Z
- **Tasks:** 3
- **Files modified:** 1

## Accomplishments
- Sequential batch execution loop processes containers one at a time
- Progress message updates in real-time for each container being processed
- One container failure does not abort the batch - remaining containers continue
- Final summary emphasizes failures with container names and reasons
- Back to List button for navigation after batch completion

## Task Commits

Each task was committed atomically:

1. **Task 1: Add Loop Over Items for sequential batch execution** - `62f50cb` (feat)
2. **Task 2: Add per-container progress updates and action execution** - `fd4c614` (feat)
3. **Task 3: Add batch summary with failure emphasis** - `b704a6c` (feat)

## Files Created/Modified
- `n8n-workflow.json` - Added 20 new nodes for batch execution flow

## New Nodes Added (20 total)

### Batch Initialization (4)
1. Initialize Batch State - Prepares batch data structure
2. Send Batch Start Message - Initial "Starting batch..." message
3. Prepare Batch Loop - Formats containers for loop iteration
4. Batch Loop - splitInBatches node with batch size 1

### Progress and Execution (10)
5. Build Progress Message - Creates per-container progress text
6. Edit Progress Message - Updates Telegram message
7. Route Batch Loop Action - Routes by action type
8. Build Batch Action Command - Prepares curl command
9. Execute Batch Container Action - Runs the action
10. Check Batch Action Result - Handles lookup vs direct result
11. Needs Action Call - IF node for two-phase execution
12. Execute Batch Action 2 - Second phase execution
13. Parse Batch Action 2 - Parses second phase result
14. Handle Action Result - Aggregates success/failure/warning

### Loop Control and Summary (4)
15. Prepare Next Iteration - Sets isComplete flag
16. Is Batch Complete - Routes to summary or loop continuation
17. Build Batch Summary - Creates failure-emphasized summary
18. Send Batch Summary - Posts final summary with Back to List button

### Callback Preparation (2)
19. Prepare Batch Stop Exec - Transforms bstop:confirm callback data
20. Prepare Batch Exec - Transforms bexec callback data

## Decisions Made

| Decision | Rationale |
|----------|-----------|
| Two-phase execution for name-only containers | Callbacks from bstop/bexec have names but no IDs - need lookup first |
| onError: continueRegularOutput | Ensures one failure doesn't abort entire batch |
| Is Batch Complete IF node | Clean routing to summary instead of relying on loop second output |
| Warnings shown in detail for <= 3 | Per context discretion - show details when few, summary when many |
| Progress edit every container | Typical batch is 2-5 containers, rate limiting not a concern |

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

**Ready for Plan 03:** Batch update workflow integration.

The following are now available for Plan 03:
- Complete batch execution pipeline for start/stop/restart
- Route Batch Loop Action output 0 (update) is empty - needs full update flow
- Pattern established for sequential execution with progress
- Error isolation and summary patterns ready to reuse

**Note:** Route Batch Loop Action update output needs to connect to the full update sequence (pull, stop, remove, create, start) similar to single-container update flow.

---
*Phase: 09-batch-operations*
*Completed: 2026-02-04*