Log slow API requests with server spans and client timing

internal/store/store.go

@@ -14,9 +14,8 @@ import (
 	"sync"
 	"time"
 
-	_ "modernc.org/sqlite"
-
 	"g.fc.run/ai/byre/internal/api"
+	"g.fc.run/ai/byre/internal/trace"
 )
 
 var ErrNotFound = errors.New("not found")
@@ -85,10 +84,11 @@ type Store struct {
 
 func Open(path string, portFirst int, onEvent func([]api.Event)) (*Store, error) {
 	dsn := "file:" + path + "?_pragma=journal_mode(WAL)&_pragma=busy_timeout(5000)&_pragma=foreign_keys(1)&_txlock=immediate"
-	db, err := sql.Open("sqlite", dsn)
+	connector, err := newTracedConnector(dsn)
 	if err != nil {
 		return nil, err
 	}
+	db := sql.OpenDB(connector)
 
 	err = migrate(db, filepath.Dir(path))
 	if err != nil {
@@ -1505,7 +1505,9 @@ func (s *Store) Counts(ctx context.Context) (Counts, error) {
 type emitFunc func(api.Event) error
 
 func (s *Store) write(ctx context.Context, fn func(tx *sql.Tx, emit emitFunc) error) error {
+	locked := trace.Start(ctx, "store lock")
 	s.writeMu.Lock()
+	locked()
 	defer s.writeMu.Unlock()
 
 	tx, err := s.db.BeginTx(ctx, nil)