Mailbox store jsonl with in memory index
Skill kjuhwa/skills-hub/skills/data-pipeline/mailbox-store-jsonl-with-in-memory-index
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Append-only JSONL persistence with in-memory index for fast message lookup and ordering
SKILL.md
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JSONL mailbox with in-memory index
Use a JSONL file (one JSON object per line) as the durable append-only log, and maintain in-memory indexes (Map for ID lookup, arrays for ordered inbound/outbound refs) rebuilt on startup.
Mechanism
- Append:
fs.appendFileSync(path, JSON.stringify(msg) + '\n')thenindex.set(msg.id, msg). - Load: read file line-by-line,
JSON.parseeach, populate index. Skip malformed lines with a warning. - Schema evolve: include a
schema_versionon each record; migrate in a single pass when rebuilding the index. - Separate volatile state (cursors, ack marks) into a side JSON file so the log stays append-only.
When to reuse
- Local message queues, outbox patterns, event logs that must survive restart.
- Systems that want human-inspectable storage (grep, tail) without a database.
- Anywhere you need durable writes + fast lookup without SQLite/LMDB.