add sqlite test and fix sqlite tag queries.

sqlite3/query.go

@@ -120,9 +120,13 @@ func (b SQLite3Backend) queryEventsSql(filter nostr.Filter, doCount bool) (strin
 
 	// we use a very bad implementation in which we only check the tag values and
 	// ignore the tag names
-	for _, tagValue := range tagQuery {
-		conditions = append(conditions, `tags LIKE ? ESCAPE '\'`)
-		params = append(params, `%`+strings.ReplaceAll(tagValue, `%`, `\%`)+`%`)
+	if len(tagQuery) > 0 {
+		orTag := make([]string, len(tagQuery))
+		for i, tagValue := range tagQuery {
+			orTag[i] = `tags LIKE ? ESCAPE '\'`
+			params = append(params, `%`+strings.ReplaceAll(tagValue, `%`, `\%`)+`%`)
+		}
+		conditions = append(conditions, "("+strings.Join(orTag, "OR ")+")")
 	}
 
 	if filter.Since != nil {

test/db_test.go

@@ -12,6 +12,7 @@ import (
 	"github.com/fiatjaf/eventstore/bolt"
 	"github.com/fiatjaf/eventstore/lmdb"
 	"github.com/fiatjaf/eventstore/slicestore"
+	"github.com/fiatjaf/eventstore/sqlite3"
 	"github.com/nbd-wtf/go-nostr"
 	"github.com/stretchr/testify/require"
 )
@@ -41,6 +42,11 @@ func TestBolt(t *testing.T) {
 	runTestOn(t, &bolt.BoltBackend{Path: dbpath + "bolt"})
 }
 
+func TestSQLite(t *testing.T) {
+	os.RemoveAll(dbpath + "sqlite")
+	runTestOn(t, &sqlite3.SQLite3Backend{DatabaseURL: dbpath + "sqlite"})
+}
+
 func runTestOn(t *testing.T, db eventstore.Store) {
 	err := db.Init()
 	require.NoError(t, err)