✨ Added preset theme

internal/services/database_service.go

@@ -67,13 +67,12 @@ CREATE TABLE IF NOT EXISTS key_bindings (
 	sqlCreateThemesTable = `
 CREATE TABLE IF NOT EXISTS themes (
     id INTEGER PRIMARY KEY AUTOINCREMENT,
-    name TEXT NOT NULL,
+    name TEXT NOT NULL UNIQUE,
     type TEXT NOT NULL,
     colors TEXT NOT NULL,
     is_default INTEGER NOT NULL DEFAULT 0,
     created_at TEXT NOT NULL,
-    updated_at TEXT NOT NULL,
-    UNIQUE(type, is_default)
+    updated_at TEXT NOT NULL
 )`
 )
 
@@ -222,6 +221,8 @@ func (ds *DatabaseService) createIndexes() error {
 		// Themes indexes
 		`CREATE INDEX IF NOT EXISTS idx_themes_type ON themes(type)`,
 		`CREATE INDEX IF NOT EXISTS idx_themes_is_default ON themes(is_default)`,
+		// 条件唯一索引：确保每种类型只能有一个默认主题
+		`CREATE UNIQUE INDEX IF NOT EXISTS idx_themes_type_default ON themes(type) WHERE is_default = 1`,
 	}
 
 	for _, index := range indexes {