feat: add sqlite-backed API docs and tests

internal/db/sqlite.go

@@ -7,7 +7,7 @@ import (
 	"os"
 	"path/filepath"
 
-	_ "github.com/mattn/go-sqlite3"
+	_ "modernc.org/sqlite"
 )
 
 //go:embed migrations/001_initial.sql
@@ -18,7 +18,7 @@ func Open(databaseURL string) (*sql.DB, error) {
 		return nil, fmt.Errorf("mkdir db dir: %w", err)
 	}
 
-	db, err := sql.Open("sqlite3", databaseURL+"?_foreign_keys=on&_busy_timeout=5000")
+	db, err := sql.Open("sqlite", databaseURL+"?_pragma=foreign_keys(1)&_pragma=busy_timeout(5000)")
 	if err != nil {
 		return nil, err
 	}