docs(08-01): complete session bug fix plan
Tasks completed: 1/1 - Replace session_id() with unique form_id pattern SUMMARY: .planning/phases/08-bugfixes-legacy-parity/08-01-SUMMARY.md
This commit is contained in:
@@ -10,18 +10,18 @@ See: .planning/PROJECT.md (updated 2026-01-16)
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## Current Position
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Phase: 8 of 9 (Bug Fixes & Legacy Parity)
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Plan: Not started
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Status: Ready to plan
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Last activity: 2026-02-06 — Added gap closure phases from milestone audit
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Plan: 1 of 2 complete
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Status: In progress
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Last activity: 2026-02-06 — Completed 08-01-PLAN.md (session bug fix)
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Progress: ███████░░░ 78% (7/9 phases)
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Progress: ████████░░ 84% (8/9.5 plans)
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## Performance Metrics
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**Velocity:**
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- Total plans completed: 7
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- Average duration: ~45 min per phase
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- Total execution time: ~5.5 hours
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- Total plans completed: 8
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- Average duration: ~30 min per plan
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- Total execution time: ~4 hours
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**By Phase:**
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@@ -34,7 +34,7 @@ Progress: ███████░░░ 78% (7/9 phases)
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| 5 | 1 | Real-time calculations with German decimal support |
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| 6 | 1 | Form handler, email generator, wp_mail() integration |
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| 7 | 1 | Captcha verification and inline validation |
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| 8 | — | Bug fixes & legacy parity (gap closure) |
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| 8 | 1/2 | Bug fixes & legacy parity (gap closure) |
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| 9 | — | Internationalization (gap closure) |
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**Overall Trend:**
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@@ -55,6 +55,9 @@ Recent decisions affecting current work:
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| 1 | Capability: edit_posts | Allow editors and admins (not just admins) |
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| 1 | Menu position 25 | Below Comments, logical grouping |
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| Audit | Fix all 4 gaps for v1.0 | Full legacy parity before shipping |
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| 8-01 | Use uniqid('', true) with more_entropy | Extra entropy prevents collisions under high traffic |
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| 8-01 | Pass form_id via hidden field + GET param | WordPress-native, no sessions needed |
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| 8-01 | Delete transient after display | Prevents stale errors on refresh |
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### Deferred Issues
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@@ -68,7 +71,7 @@ None.
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## Session Continuity
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Last session: 2026-02-06
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Stopped at: Created gap closure phases 8-9
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Last session: 2026-02-06T13:55:34Z
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Stopped at: Completed 08-01-PLAN.md
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Resume file: None
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Next up: Plan phase 8 (Bug Fixes & Legacy Parity)
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Next up: Plan 08-02 (Additional work sections and Sonstiges integration)
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107
.planning/phases/08-bugfixes-legacy-parity/08-01-SUMMARY.md
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107
.planning/phases/08-bugfixes-legacy-parity/08-01-SUMMARY.md
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@@ -0,0 +1,107 @@
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---
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phase: 08-bugfixes-legacy-parity
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plan: 01
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subsystem: form-validation
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tags: [wordpress, transients, form-handling, error-display]
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# Dependency graph
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requires:
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- phase: 07-captcha-validation
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provides: Captcha verification and validation error handling
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provides:
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- Per-submission unique form IDs preventing error cross-contamination
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- Consistent error format for both captcha and validation errors
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- WordPress-native transient keys using hidden field pattern
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affects: [08-02, any future form validation work]
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# Tech tracking
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tech-stack:
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added: []
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patterns:
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- "Hidden form ID with uniqid() for per-submission transient keys"
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- "Consistent error format: array('messages' => [...], 'fields' => [...])"
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- "GET parameter for form_id to retrieve errors after redirect"
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key-files:
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created: []
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modified:
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- includes/class-form-renderer.php
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- includes/class-form-handler.php
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key-decisions:
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- "Use uniqid('', true) with more_entropy for collision resistance under load"
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- "Pass form_id via hidden field and GET parameter (no sessions, no cookies)"
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- "Delete transient immediately after display to prevent stale errors"
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patterns-established:
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- "Form error handling: Hidden field → POST → Transient → Redirect with GET param → Display → Delete"
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- "Validation error wrapping: Always use 'messages' and 'fields' keys for consistency"
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# Metrics
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duration: 1min
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completed: 2026-02-06
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---
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# Phase 8 Plan 1: Session Bug Fix Summary
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**Replaced unreliable session_id() with unique form_id using uniqid() and hidden fields, fixing production-blocking error cross-contamination between users**
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## Performance
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- **Duration:** 1 min
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- **Started:** 2026-02-06T13:54:24Z
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- **Completed:** 2026-02-06T13:55:34Z
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- **Tasks:** 1
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- **Files modified:** 2
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## Accomplishments
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- Eliminated session_id() bug causing all users to share 'umzugsliste_errors_default' transient key
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- Implemented WordPress-native hidden field pattern for per-submission unique IDs
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- Fixed validation error format inconsistency (flat array vs array with 'messages' key)
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- Both captcha and validation errors now use consistent structure
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Replace session_id() with hidden form ID in renderer and handler** - `28fcfcc` (fix)
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**Plan metadata:** (will be committed separately with STATE.md)
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## Files Created/Modified
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- `includes/class-form-renderer.php` - Generate unique form_id with uniqid(), retrieve errors via GET parameter, add hidden field
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- `includes/class-form-handler.php` - Extract form_id from POST, use for transient keys, redirect with form_id query param, wrap validation errors in proper format
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## Decisions Made
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- **Use uniqid('', true) with more_entropy parameter:** Extra entropy prevents collisions under high traffic
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- **Pass form_id via hidden field and GET parameter:** WordPress-native approach that works on all hosting (no session_start() required)
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- **Delete transient immediately after display:** Prevents stale errors from persisting on page refresh
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- **Wrap validation errors in array with 'messages' key:** Matches captcha error format expected by render_validation_errors()
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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None - straightforward implementation following research patterns.
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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Error handling foundation is solid. Ready to:
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- Integrate additional work sections (Plan 08-02)
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- Add Sonstiges free text field (Plan 08-02)
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- No blockers or concerns
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Technical notes for future work:
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- The form_id pattern can be reused for any per-submission tracking needs
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- Transient expiration (300s) is appropriate for form errors but can be adjusted if needed
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- The error format ('messages' + 'fields' arrays) supports field-specific error highlighting if implemented later
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---
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*Phase: 08-bugfixes-legacy-parity*
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*Completed: 2026-02-06*
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