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

internal/snapshot/flatten.go

@@ -8,7 +8,7 @@ import (
 	"strings"
 )
 
-// Flat keys use "/" as the separator. Property paths inside Redis are
+// Flat keys use "/" as the separator. Property paths inside the store are
 // stored as e.g. "fileinfo/streamdetails/video/0/codec".
 const flatSep = "/"
 
@@ -33,7 +33,7 @@ func Reconstruct(flat map[string]string) interface{} {
 }
 
 // Flatten is the inverse of Reconstruct: walks a nested value and produces a
-// flat property map whose values are all strings (Redis-ready).
+// flat property map whose values are all strings (store-ready).
 //
 // Arrays become numeric path segments ("genre/0", "genre/1"). Nil/missing
 // values are stored as "" to preserve the field's presence — this matches
@@ -127,7 +127,7 @@ func flattenInto(v interface{}, path string, out map[string]string) {
 		out[path] = ""
 	case map[string]interface{}:
 		if len(t) == 0 && path != "" {
-			// Empty objects don't have a Redis representation; skip.
+			// Empty objects don't have a flat-key representation; skip.
 			return
 		}
 		for k, child := range t {