Fix extremely slow removals

initialize.sql

@@ -23,6 +23,7 @@ CREATE TABLE IF NOT EXISTS node(
 ) STRICT;
 
 CREATE INDEX IF NOT EXISTS node__sha1 ON node(sha1);
+CREATE INDEX IF NOT EXISTS node__parent ON node(parent);
 CREATE UNIQUE INDEX IF NOT EXISTS node__parent_name
 ON node(IFNULL(parent, 0), name);
 

main.go

@@ -94,10 +94,15 @@ func init() {
 }
 
 func openDB(directory string) error {
+	galleryDirectory = directory
+
 	var err error
 	db, err = sql.Open("sqlite3_custom", "file:"+filepath.Join(directory,
 		nameOfDB+"?_foreign_keys=1&_busy_timeout=1000"))
-	galleryDirectory = directory
+	if err != nil {
+		return err
+	}
+	_, err = db.Exec(initializeSQL)
 	return err
 }
 
@@ -303,10 +308,6 @@ func cmdInit(fs *flag.FlagSet, args []string) error {
 		return err
 	}
 
-	if _, err := db.Exec(initializeSQL); err != nil {
-		return err
-	}
-
 	// XXX: There's technically no reason to keep images as symlinks,
 	// we might just keep absolute paths in the database as well.
 	if err := os.MkdirAll(