forked from jsnbuchanan/crowd-funder-for-time-pwa
0fae8bbda6
- Phase 1: Simplify Migration Definition ✅ * Remove duplicate SQL definitions from migration 004 * Eliminate recovery logic that could cause duplicate execution * Establish single source of truth for migration SQL - Phase 2: Fix Database Result Handling ✅ * Remove DatabaseResult type assumptions from migration code * Implement database-agnostic result extraction with extractSingleValue() * Normalize results from AbsurdSqlDatabaseService and CapacitorPlatformService - Phase 3: Ensure Atomic Execution ✅ * Remove individual statement execution logic * Execute migrations as single atomic SQL blocks only * Add explicit rollback instructions and failure cause logging * Ensure migration tracking is accurate - Phase 4: Remove Excessive Debugging ✅ * Move detailed logging to development-only mode * Preserve essential error logging for production * Optimize startup performance by reducing logging overhead * Maintain full debugging capability in development Migration system now follows single-source, atomic execution principle with improved performance and comprehensive error handling. Timestamp: 2025-09-17 05:08:05 UTC
199 lines
8.6 KiB
Markdown
199 lines
8.6 KiB
Markdown
# Migration 004 Complexity Resolution Plan
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**Document Version**: 1.3
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**Author**: Matthew Raymer
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**Date**: 2025-01-27
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**Status**: Implementation Phase - Phase 1 Complete
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## Problem Summary
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The current migration 004 implementation has become overly complex with multiple critical issues that create serious risks for data integrity and application performance.
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### Four Most Critical Issues
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1. **Duplicate SQL Definitions**: Migration 004 SQL exists in three separate locations (main sql field, statements array, recovery logic), making it impossible to ensure all users run identical statements.
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2. **Non-Atomic Execution**: Individual statements continue executing even if earlier statements fail, causing partial data migration and potential data loss.
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3. **Incorrect Database Result Handling**: Code assumes PlatformService abstraction format when called directly from raw database services, causing runtime errors.
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4. **Duplicate Execution Risk**: Recovery logic could re-run statements that already executed successfully, leading to data corruption.
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## Resolution Principles
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**Guiding Principle**: All migrations must execute from a single SQL source in the MIGRATIONS array, as one atomic statement.
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- **Single Source of Truth**: Only one place defines migration SQL
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- **Atomic Operations**: Migration succeeds completely or fails completely
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- **Database Agnostic**: Result handling works with any database service
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- **Minimal Overhead**: No unnecessary logging or validation
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- **Simple Recovery**: If migration fails, it should be obvious and fixable
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## Implementation Phases
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### Phase 1: Simplify Migration Definition ✅ COMPLETED
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**Objective**: Establish single source of truth for migration SQL
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**Actions**:
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- ✅ Remove `statements` array from migration 004 definition
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- ✅ Keep only the single `sql` field as the authoritative source
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- ✅ Remove all recovery logic that duplicates SQL statements
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- ✅ Ensure migration SQL is self-contained and atomic
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**Deliverables**:
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- ✅ Clean migration definition with single SQL source
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- ✅ Removed duplicate SQL definitions
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- ✅ Eliminated recovery logic complexity
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### Phase 2: Fix Database Result Handling ✅ COMPLETED
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**Objective**: Make result handling database-agnostic
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**Actions**:
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- ✅ Remove DatabaseResult type assumptions from migration code
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- ✅ Implement proper result extraction based on actual database service
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- ✅ Use the `extractMigrationNames` function pattern consistently
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- ✅ Make result handling work with any database service implementation
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- ✅ Normalize results from AbsurdSqlDatabaseService and CapacitorPlatformService into shared internal format
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**Deliverables**:
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- ✅ Database-agnostic result handling
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- ✅ Consistent result extraction across all database services
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- ✅ Removed type casting assumptions
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- ✅ Shared internal result format for all database services
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### Phase 3: Ensure Atomic Execution ✅ COMPLETED
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**Objective**: Guarantee migration succeeds completely or fails completely
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**Actions**:
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- ✅ Modify migration service to execute single SQL block only
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- ✅ Remove individual statement execution logic
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- ✅ Implement proper error handling that prevents partial execution
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- ✅ Ensure migration tracking is accurate
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- ✅ Provide explicit rollback/restore instructions for migration failures
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- ✅ Ensure migration logs indicate failure cause and required operator action
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**Deliverables**:
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- ✅ Atomic migration execution
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- ✅ Proper error handling
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- ✅ Accurate migration tracking
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- ✅ Clear recovery procedures
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### Phase 4: Remove Excessive Debugging ✅ COMPLETED
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**Objective**: Eliminate performance overhead from debugging code
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**Actions**:
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- ✅ Remove detailed logging that slows startup
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- ✅ Keep only essential error logging
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- ✅ Remove complex validation logic that runs on every startup
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- ✅ Move debugging code to test page or development-only mode
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**Deliverables**:
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- ✅ Faster application startup
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- ✅ Cleaner production code
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- ✅ Debugging available only when needed
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### Phase 5: Testing & Validation
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**Objective**: Ensure simplified migration works correctly
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**Actions**:
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- Test migration execution with different database services
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- Verify no duplicate execution occurs
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- Confirm proper error handling
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- Validate data integrity after migration
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- Test rollback/restore scenarios to confirm system recovery paths
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- Test edge cases: empty database, partially migrated database, already-migrated database
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- Test concurrency scenarios (multiple app instances/migrations starting simultaneously)
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- Test cross-platform/device differences (SQLite, AbsurdSQL, Capacitor DB adapters)
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**Deliverables**:
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- Working migration system
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- No duplicate execution
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- Proper error handling
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- Data integrity maintained
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- Validated recovery procedures
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- Edge case coverage confirmed
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- Documented test results as artifacts for future regression testing
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## Performance & Debugging
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**Current Issue**: Excessive logging and validation code runs on every app startup, slowing application performance.
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**Solution**:
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- Debugging/logging is acceptable in development/test environments
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- Production startup must not be slowed by migration debugging
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- Move complex validation to test page or development-only mode
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- Keep only essential error logging for production
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## Rollback & Recovery Procedures
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### Manual Rollback Steps
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1. **Stop Application**: Ensure no active database connections
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2. **Restore Database**: Use snapshot/backup to restore pre-migration state
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3. **Clear Migration Tracking**: Remove migration 004 entry from migrations table
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4. **Verify State**: Confirm active_identity table is removed and settings.activeDid is restored
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5. **Restart Application**: Test normal operation
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### Automated Rollback
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- **Automated Detection**: Migration service detects failure and triggers rollback
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- **Database Restore**: Automated restoration from pre-migration snapshot
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- **Logging**: Detailed rollback logs with failure cause and recovery actions
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- **Validation**: Automated verification of rollback success
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### Recovery Validation
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- **Data Integrity Check**: Verify all data is consistent with pre-migration state
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- **Migration Status**: Confirm migration tracking reflects correct state
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- **Application Functionality**: Test core features work correctly
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- **Performance Baseline**: Confirm startup performance matches pre-migration levels
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## Files Requiring Changes
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### Core Migration Files (Primary Changes)
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- `src/db-sql/migration.ts` - Remove duplicate SQL definitions, fix DatabaseResult usage, remove recovery logic
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- `src/services/migrationService.ts` - Remove individual statement execution, ensure atomic execution
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### Database Service Files (Result Handling Fixes)
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- `src/services/AbsurdSqlDatabaseService.ts` - Fix result extraction for migration queries
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- `src/services/platforms/CapacitorPlatformService.ts` - Fix result extraction for migration queries
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**Note**: Verify all file paths match repository reality as part of CI validation.
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## Success Criteria
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- [ ] Migration 004 SQL defined in single location only
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- [ ] Migration executes atomically (all-or-nothing)
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- [ ] Database result handling works with all database services
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- [ ] No duplicate statement execution possible
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- [ ] Startup time reduced by at least 20% compared to pre-fix baseline (measured via cold app start profiling logs)
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- [ ] Migration tracking is accurate and reliable
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- [ ] Error handling is clear and actionable
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## Next Steps
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1. **Review and Approve Plan**: Get stakeholder approval for this approach
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2. **Phase 1 Implementation**: Begin with simplifying migration definition
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3. **Testing**: Validate each phase before proceeding
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4. **Assign Migration Owner**: Designate clear owner for future migration reviews
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5. **Create Review Checklist**: Define lightweight checklist (SQL duplication, atomicity, error handling) to prevent recurrence
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## Dependencies
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- Migration service architecture
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- Database service implementations
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- Testing infrastructure
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- Documentation system
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- Seed datasets or controlled test states for reproducible validation
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- Snapshot/restore utilities for rollback testing
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## Lessons Learned
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**Process Improvement Note**: This migration complexity highlights the importance of closer review and consolidation of AI-generated code. Uncontrolled proliferation of generated logic leads to fragmentation, review fatigue, and system instability. Future development should prioritize:
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- Single source of truth for all critical logic
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- Atomic operations over complex multi-step processes
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- Regular consolidation and simplification of generated code
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- Clear ownership and review processes for migration logic
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---
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*This document will be updated as the implementation progresses and new insights are gained.*
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