canvas-website/DATA_CONVERSION_SUMMARY.md

Data Conversion Summary

Overview

This document summarizes the data conversion implementation from the old tldraw sync format to the new automerge sync format.

Conversion Paths

The system handles three data formats automatically:

1. Automerge Array Format

• Format: [{ state: { id: "...", ... } }, ...]
• Conversion: convertAutomergeToStore()
• Handles: Raw Automerge document format

2. Store Format (Already Converted)

• Format: { store: { "recordId": {...}, ... }, schema: {...} }
• Conversion: None needed - already in correct format
• Handles: Previously converted documents

3. Old Documents Format (Legacy)

• Format: { documents: [{ state: {...} }, ...] }
• Conversion: migrateDocumentsToStore()
• Handles: Old tldraw sync format

Validation & Error Handling

Record Validation

• ✅ Validates state property exists
• ✅ Validates state.id exists and is a string
• ✅ Validates state.typeName exists (for documents format)
• ✅ Skips invalid records with detailed logging
• ✅ Preserves valid records

Shape Migration

• ✅ Ensures required properties (x, y, rotation, opacity, isLocked, meta, index)
• ✅ Moves w/h from top-level to props for geo shapes
• ✅ Fixes richText structure
• ✅ Preserves custom shape properties (ObsNote, Holon, etc.)
• ✅ Tracks and verifies custom shapes

Custom Records

• ✅ Preserves obsidian_vault: records
• ✅ Tracks custom record count
• ✅ Logs custom record IDs for verification

Logging & Statistics

All conversion functions now provide comprehensive statistics:

Conversion Statistics Include:

• Total records processed
• Successfully converted count
• Skipped records (with reasons)
• Errors encountered
• Custom records preserved
• Shape types distribution
• Custom shapes preserved

Log Levels:

• Info: Conversion statistics, successful conversions
• Warn: Skipped records, warnings (first 10 shown)
• Error: Conversion errors with details

Data Preservation Guarantees

What is Preserved:

• ✅ All valid shape data
• ✅ All custom shape properties (ObsNote, Holon, etc.)
• ✅ All custom records (obsidian_vault)
• ✅ All metadata
• ✅ All text content
• ✅ All richText content (structure fixed, content preserved)

What is Fixed:

• 🔧 Missing required properties (defaults added)
• 🔧 Invalid property locations (w/h moved to props)
• 🔧 Malformed richText structure
• 🔧 Missing typeName (inferred where possible)

What is Skipped:

• ⚠️ Records with missing state property
• ⚠️ Records with missing state.id
• ⚠️ Records with invalid state.id type
• ⚠️ Records with missing state.typeName (for documents format)

Testing

Unit Tests

• test-data-conversion.ts: Tests edge cases with malformed data
• Covers: missing fields, null records, invalid types, custom records

Integration Testing

• Test with real R2 data (see test-r2-conversion.md)
• Verify data integrity after conversion
• Check logs for warnings/errors

Migration Safety

Safety Features:

1. Non-destructive: Original R2 data is not modified until first save
2. Error handling: Invalid records are skipped, not lost
3. Comprehensive logging: All actions are logged for debugging
4. Fallback: Creates empty document if conversion fails completely

Rollback:

• Original data remains in R2 until overwritten
• Can restore from backup if needed
• Conversion errors don't corrupt existing data

Performance

• Conversion happens once per room (cached)
• Statistics logging is efficient (limited to first 10 errors)
• Shape migration only processes shapes (not all records)
• Custom record tracking is lightweight

Next Steps

1. ✅ Conversion logic implemented and validated
2. ✅ Comprehensive logging added
3. ✅ Custom records/shapes preservation verified
4. ✅ Edge case handling implemented
5. ⏳ Test with real R2 data (manual process)
6. ⏳ Monitor production conversions

Files Modified

• worker/AutomergeDurableObject.ts: Main conversion logic
  • getDocument(): Format detection and routing
  • convertAutomergeToStore(): Automerge array conversion
  • migrateDocumentsToStore(): Old documents format conversion
  • migrateShapeProperties(): Shape property migration

Key Improvements

1. Validation: All records are validated before conversion
2. Logging: Comprehensive statistics for debugging
3. Error Handling: Graceful handling of malformed data
4. Preservation: Custom records and shapes are tracked and verified
5. Safety: Non-destructive conversion with fallbacks