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diffwireauto dbe52164da task(#920): B4 Epic B verification against the owner's real database ... Ran the migration over a copy of the live 41.17 MiB database, 138 message history keys: keys migrated : 138 of 138 records in blobs : 64,883 rows stored : 64,883 elapsed : 4,382 ms Exact parity, no refusals. Every blob is byte-identical afterwards, checked by length and content hash per key, which is the promise that makes this recoverable. Per-message save cost against history length, median of 20: 500 messages 0.124 ms 5,000 0.126 ms 50,000 0.133 ms A hundred times the history for 1.07x the cost. The Feature's "done when" was that receiving a message costs the same at 50,000 messages as at 50, and that is now true. For contrast, the blob path blocked the UI for 381 ms at 9,230 messages. One-time migration cost for the worst key, 5.38 MiB and 9,230 messages, with the heartbeat harness from #919: UI blocked 64 ms wall 447 ms (30 heartbeats) So the first open of the biggest channel after this ships costs a 64 ms hitch on this desktop, once, and the UI stays live through the rest. That number needed a correction before it could be reported. The first run measured 166 ms, because the harness opened the database with a plain `NativeDatabase`, which executes SQL on the calling isolate. Production uses `drift_flutter`'s `driftDatabase()`, which hosts the connection in a background isolate, so the harness was charging the UI isolate for work that does not happen there. Switched to `NativeDatabase.createInBackground`, which is the shape that ships: 64 ms. The parity test refuses to invent data: without `--dart-define=BENCH_DB` it prints that it measured nothing rather than synthesising a database, and it copies the file it is given rather than writing to it. Citadel: meshcore-open-i8t Refs #920, #917, #334 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>		3 weeks ago
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anr_block_time_bench.dart	task(#919): A5 Epic A verification: isolate gate + block-time benchmark	3 weeks ago
real_db_row_migration_bench.dart	task(#920): B4 Epic B verification against the owner's real database	3 weeks ago