replace Redis with an embedded SQLite string->string KV store (group commit, in-tx events, SQL search)

internal/watcher/watcher.go

@@ -11,7 +11,6 @@ import (
 	"github.com/metazla/meta-core/internal/storage"
 )
 
-
 // Watcher provides file scanning and event dispatching
 type Watcher struct {
 	config        *config.Config
@@ -26,8 +25,8 @@ type Watcher struct {
 }
 
 // SetStorageClient lets the watcher persist the (path, size, mtime, midhash)
-// tuple to Redis whenever it computes a midhash. Without this, only the
-// in-memory state registry knows about the file — Redis would only learn
+// tuple to the store whenever it computes a midhash. Without this, only the
+// in-memory state registry knows about the file — the store would only learn
 // about it via downstream consumers of the event stream.
 func (w *Watcher) SetStorageClient(s *storage.Client) {
 	w.storage = s
@@ -35,7 +34,7 @@ func (w *Watcher) SetStorageClient(s *storage.Client) {
 
 // writeFileTuple persists path/size/mtime/midhash for a freshly-hashed file.
 // Caller already has all four values from its existing os.Stat / FileInfo —
-// no extra IO is performed here beyond the Redis writes themselves.
+// no extra IO is performed here beyond the store writes themselves.
 //
 // Flow:
 //   - Look up the midhash CID in the reverse index (cid:<midhash> → uuid)
@@ -46,7 +45,7 @@ func (w *Watcher) SetStorageClient(s *storage.Client) {
 //     record the new path in the duplicates set and refresh size/mtime
 //
 // This is also the inverse-index that lets a fresh meta-core boot skip
-// re-mid-hashing files whose (path, size, mtime) match what's in Redis,
+// re-mid-hashing files whose (path, size, mtime) match what's stored,
 // via HydrateStateFromStorage below.
 func (w *Watcher) writeFileTuple(absPath string, size, mtimeNano int64, midhash string) {
 	if w.storage == nil || midhash == "" {
@@ -270,7 +269,7 @@ func (w *Watcher) ScanDirectoryDiff(root string, watcherID string) DiffScanResul
 }
 
 // WatcherRoot pairs a watcher's id with the absolute path it watches. The
-// hydrator uses Root to decide which Redis-tracked file belongs to which
+// hydrator uses Root to decide which stored file belongs to which
 // in-memory WatcherState.
 type WatcherRoot struct {
 	ID   string
@@ -278,7 +277,7 @@ type WatcherRoot struct {
 }
 
 // HydrateStateFromStorage repopulates the per-watcher in-memory state from
-// the (filePath, sizeByte, mtimeNano) tuples in Redis. After this runs, the
+// the (filePath, sizeByte, mtimeNano) tuples in the store. After this runs, the
 // next scan tick will see existing files as "known" and skip
 // ComputeMidHash256 for any whose size+mtime match — turning a cold-start
 // rescan from minutes to seconds on a populated library.
@@ -416,4 +415,3 @@ func (w *Watcher) GetRecentEvents(sinceMS int64, limit int) []FileEvent {
 func (w *Watcher) GetFilesPath() string {
 	return w.filesPath
 }
-