Optimize SQLite3 access. Mainly separate read access from write access.

Based on tips from https://archive.is/Xfjh6#selection-257.0-278.0

persistence/dbx_builder.go

@@ -0,0 +1,50 @@
+package persistence
+
+import (
+	"github.com/navidrome/navidrome/db"
+	"github.com/pocketbase/dbx"
+)
+
+type dbxBuilder struct {
+	dbx.Builder
+	rdb dbx.Builder
+}
+
+func NewDBXBuilder(d db.DB) *dbxBuilder {
+	b := &dbxBuilder{}
+	b.Builder = dbx.NewFromDB(d.WriteDB(), db.Driver)
+	b.rdb = dbx.NewFromDB(d.ReadDB(), db.Driver)
+	return b
+}
+
+func (d *dbxBuilder) NewQuery(s string) *dbx.Query {
+	return d.rdb.NewQuery(s)
+}
+
+func (d *dbxBuilder) Select(s ...string) *dbx.SelectQuery {
+	return d.rdb.Select(s...)
+}
+
+func (d *dbxBuilder) GeneratePlaceholder(i int) string {
+	return d.rdb.GeneratePlaceholder(i)
+}
+
+func (d *dbxBuilder) Quote(s string) string {
+	return d.rdb.Quote(s)
+}
+
+func (d *dbxBuilder) QuoteSimpleTableName(s string) string {
+	return d.rdb.QuoteSimpleTableName(s)
+}
+
+func (d *dbxBuilder) QuoteSimpleColumnName(s string) string {
+	return d.rdb.QuoteSimpleColumnName(s)
+}
+
+func (d *dbxBuilder) QueryBuilder() dbx.QueryBuilder {
+	return d.rdb.QueryBuilder()
+}
+
+func (d *dbxBuilder) Transactional(f func(*dbx.Tx) error) (err error) {
+	return d.Builder.(*dbx.DB).Transactional(f)
+}