feat: complete remaining Go backend modules

backend/internal/postgres/templates_test.go

@@ -0,0 +1,86 @@
+package postgres
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"testing"
+	"time"
+
+	"git.nianxx.cn/wangxuming/NianAIGC/backend/internal/templates"
+)
+
+func TestImageTemplateCatalogUsesOwnerScopedExplicitSQL(t *testing.T) {
+	now := time.Date(2026, 8, 13, 0, 0, 0, 0, time.UTC)
+	querier := &templateQuerier{rows: &templateRows{rows: [][]any{{"t1", "owner", "Name", nil, "Prompt", nil, []byte(`{"engine":"jimeng"}`), 2, now, now}}}}
+	db := NewDatabase(Config{Backend: BackendPostgres}, querier)
+	items, err := db.ListTemplates(context.Background(), "owner")
+	if err != nil || len(items) != 1 || items[0].Settings.Engine != "jimeng" {
+		t.Fatalf("items=%#v err=%v", items, err)
+	}
+	if querier.query != ListImageTemplatesSQL || len(querier.args) != 1 || querier.args[0] != "owner" {
+		t.Fatalf("query=%q args=%#v", querier.query, querier.args)
+	}
+}
+
+func TestImageTemplateUpdatePreservesOmittedNullableFields(t *testing.T) {
+	now := time.Now().UTC()
+	querier := &templateQuerier{rows: &templateRows{rows: [][]any{{"t1", "owner", "Name", "desc", "Prompt", "/p", []byte(`{}`), 0, now, now}}}}
+	db := NewDatabase(Config{Backend: BackendPostgres}, querier)
+	name := "Name"
+	item, found, err := db.UpdateTemplate(context.Background(), "owner", "t1", templates.Patch{Name: &name}, now)
+	if err != nil || !found || item.ID != "t1" {
+		t.Fatalf("item=%#v found=%v err=%v", item, found, err)
+	}
+	if querier.query != UpdateImageTemplateSQL || querier.args[3] != false || querier.args[6] != false {
+		t.Fatalf("unexpected args %#v", querier.args)
+	}
+}
+
+type templateQuerier struct {
+	rows  Rows
+	query string
+	args  []any
+}
+
+func (querier *templateQuerier) Query(_ context.Context, query string, args ...any) (Rows, error) {
+	querier.query = query
+	querier.args = args
+	return querier.rows, nil
+}
+
+type templateRows struct {
+	rows  [][]any
+	index int
+}
+
+func (*templateRows) Close()          {}
+func (*templateRows) Err() error      { return nil }
+func (rows *templateRows) Next() bool { return rows.index < len(rows.rows) }
+func (rows *templateRows) Scan(dest ...any) error {
+	row := rows.rows[rows.index]
+	rows.index++
+	if len(dest) != len(row) {
+		return fmt.Errorf("scan arity")
+	}
+	for index, value := range row {
+		switch target := dest[index].(type) {
+		case *string:
+			if value != nil {
+				*target = value.(string)
+			}
+		case *sql.NullString:
+			if value != nil {
+				target.String = value.(string)
+				target.Valid = true
+			}
+		case *[]byte:
+			*target = value.([]byte)
+		case *int:
+			*target = value.(int)
+		case *time.Time:
+			*target = value.(time.Time)
+		}
+	}
+	return nil
+}