Configure SQLite pragmas to reduce database lock contention#263
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Set journal_mode, synchronous, temp_store, cache_size, and mmap_size pragmas per environment (shared via the default anchor so production and development stay in sync, and any future Solid Queue/Cache/Cable databases inherit them automatically), with tighter busy timeouts and looser durability settings in test to tolerate parallel test runs. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Summary
journal_mode: wal,synchronous: normal,temp_store: memory,cache_size: -20000,mmap_size: 128MB, andwal_autocheckpoint: 10000on the shareddefault:anchor inconfig/database.ymlso production and development share one source of truth (and any future Solid Queue/Cache/Cable databases inherit it automatically).timeoutto 5000ms; test overrides with a 20000ms timeout,synchronous: off, and a 256MBmmap_sizeto tolerate parallel test-runner contention without slowing down disposable test writes.pragmas.busy_timeout— Rails' existingtimeout:key already installs a GVL-friendly busy handler, and the native pragma would replace it with a GVL-blocking one, which is worse under threaded Puma.Test plan
bin/rails runnerconfirms pragmas apply in both development and test environmentsbin/rails test— 611 runs, 0 failures