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fix: prevent SQLITE_BUSY by limiting to single connection #37

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Merged
mrz1836 merged 1 commit into from
Mar 26, 2026
Merged

fix: prevent SQLITE_BUSY by limiting to single connection #37

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10 changes: 9 additions & 1 deletion store/sqlite/sqlite.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,11 +18,14 @@ import (
)

const (
// SQLite pragmas for better concurrency
// SQLite pragmas for better concurrency and throughput
sqlitePragmas = `
PRAGMA journal_mode=WAL;
PRAGMA busy_timeout=5000;
PRAGMA synchronous=NORMAL;
PRAGMA cache_size=-64000;
PRAGMA mmap_size=268435456;
PRAGMA temp_store=MEMORY;
`
)

Expand All @@ -38,6 +41,11 @@ func NewStore(dbPath string) (*Store, error) {
return nil, fmt.Errorf("failed to open database: %w", err)
}

// SQLite only allows one writer at a time. Limiting to a single connection
// prevents SQLITE_BUSY errors under concurrent HTTP load. WAL mode still
// allows concurrent reads from this connection while a write is in progress.
db.SetMaxOpenConns(1)

if _, err := db.ExecContext(context.Background(), sqlitePragmas); err != nil {
return nil, fmt.Errorf("failed to set pragmas: %w", err)
}
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