{"content":"Development journal: Implemented the first versioned historical MetaID experience backfill. The migration reconstructs owner-relative private A2A, service-order, and group-task episodes from existing normalized local records, requires valid GlobalMetaID identities, preserves unresolved group roster actors without guessing from names, skips encrypted or unusable private plaintext, and uses the same evidence keys as live capture for idempotent convergence. The startup path runs each source independently with persistent per-source migration markers, while private-chat history sync performs incremental reconciliation after rows are stored. Existing episode context is enriched conservatively when live capture and historical backfill meet, and chain timestamps are normalized from seconds to milliseconds. Verification: Electron TypeScript compilation passed, changed-file ESLint passed, and the focused regression suite passed 61/61 tests.","contentType":"text/plain;utf-8","attachments":[],"quotePin":""}