-- Per-library excluded directories.
--
-- The global EXCLUDED_DIRS env var is the right knob for excludes that
-- every library shares (Synology @eaDir, .thumbnails, etc.). It's a
-- poor fit for "exclude this subtree from THIS library only", which
-- the natural use case for is mounting a parent directory while
-- another library already covers a child subtree underneath.
--
-- This column is parsed comma-separated, same shape as the env var,
-- and the watcher / memories / thumbnail walks each apply
-- (env_globals ∪ library.excluded_dirs) when scanning the library.
-- NULL = no extra excludes; the global env var still applies.

ALTER TABLE libraries ADD COLUMN excluded_dirs TEXT;