Data layer restructuring (#997)

* Move query builders to sqlite package
* Add transaction system
* Wrap model resolvers in transaction
* Add error return value for StringSliceToIntSlice
* Update/refactor mutation resolvers
* Convert query builders
* Remove unused join types
* Add stash id unit tests
* Use WAL journal mode

pkg/sqlite/scene_marker_test.go

@@ -0,0 +1,75 @@
+// +build integration
+
+package sqlite_test
+
+import (
+	"testing"
+
+	"github.com/stashapp/stash/pkg/models"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMarkerFindBySceneID(t *testing.T) {
+	withTxn(func(r models.Repository) error {
+		mqb := r.SceneMarker()
+
+		sceneID := sceneIDs[sceneIdxWithMarker]
+		markers, err := mqb.FindBySceneID(sceneID)
+
+		if err != nil {
+			t.Errorf("Error finding markers: %s", err.Error())
+		}
+
+		assert.Len(t, markers, 1)
+		assert.Equal(t, markerIDs[markerIdxWithScene], markers[0].ID)
+
+		markers, err = mqb.FindBySceneID(0)
+
+		if err != nil {
+			t.Errorf("Error finding marker: %s", err.Error())
+		}
+
+		assert.Len(t, markers, 0)
+
+		return nil
+	})
+}
+
+func TestMarkerCountByTagID(t *testing.T) {
+	withTxn(func(r models.Repository) error {
+		mqb := r.SceneMarker()
+
+		markerCount, err := mqb.CountByTagID(tagIDs[tagIdxWithPrimaryMarker])
+
+		if err != nil {
+			t.Errorf("error calling CountByTagID: %s", err.Error())
+		}
+
+		assert.Equal(t, 1, markerCount)
+
+		markerCount, err = mqb.CountByTagID(tagIDs[tagIdxWithMarker])
+
+		if err != nil {
+			t.Errorf("error calling CountByTagID: %s", err.Error())
+		}
+
+		assert.Equal(t, 1, markerCount)
+
+		markerCount, err = mqb.CountByTagID(0)
+
+		if err != nil {
+			t.Errorf("error calling CountByTagID: %s", err.Error())
+		}
+
+		assert.Equal(t, 0, markerCount)
+
+		return nil
+	})
+}
+
+// TODO Update
+// TODO Destroy
+// TODO Find
+// TODO GetMarkerStrings
+// TODO Wall
+// TODO Query