feat: batched inserts via mpsc channel#4
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- BatchInsertRequest type: Transaction + oneshot reply sender - spawn_batch_flusher(): mpsc channel, flushes on BATCH_INSERT_SIZE (100) or BATCH_INSERT_TIMEOUT_MS (200ms) timeout - insert_transactions_batch(): bulk INSERT ... VALUES (...),(...) RETURNING *; falls back to individual inserts on failure - AppState: batch_tx Option<mpsc::Sender<BatchInsertRequest>>, tenant_configs, profiling_manager fields added/restored - callback handler: routes through batch channel when batch_tx is Some, falls back to direct insert otherwise - main.rs: spawn_batch_flusher() called at startup - All test AppState constructions updated with new fields - Unit test: channel plumbing and reply mechanics
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Implements a batched insert buffer to reduce DB round-trips under high volume.
Changes:
or BATCH_INSERT_TIMEOUT_MS=200ms timeout
falls back to individual inserts on failure