diff --git a/db_scripts/diff/15766.down b/db_scripts/diff/15766.down
new file mode 100644
index 00000000..37255162
--- /dev/null
+++ b/db_scripts/diff/15766.down
@@ -0,0 +1,49 @@
+USE provisioning;
+
+DROP TRIGGER voip_sound_files_create_trig;
+DROP TRIGGER voip_sound_files_update_trig;
+DROP TRIGGER voip_sound_files_delete_trig;
+
+DROP TRIGGER voip_sound_sets_create_trig;
+DROP TRIGGER voip_sound_sets_update_trig;
+DROP TRIGGER voip_sound_sets_delete_trig;
+
+DROP PROCEDURE update_sound_set_handle_parents;
+
+CREATE OR REPLACE VIEW v_sound_set_files AS
+WITH RECURSIVE cte as (
+    SELECT v.id AS set_id, v.reseller_id, v.contract_id, v.name, v.description,
+           v.handle_id, v.handle_name,
+           v.id AS data_set_id,
+           JSON_ARRAY(v.id) AS parent_chain
+      FROM (SELECT s.*, h.id as handle_id, h.name as handle_name
+            FROM (voip_sound_sets s, voip_sound_handles h)
+           ) AS v
+      LEFT JOIN voip_sound_files f ON f.handle_id = v.handle_id AND f.set_id = v.id
+     WHERE v.parent_id IS NULL
+    UNION all
+    SELECT v.id AS set_id, v.reseller_id, v.contract_id, v.name, v.description,
+           v.handle_id, v.handle_name,
+           IF(v.use_parent = 0, v.id, cte.data_set_id) AS data_set_id,
+           JSON_ARRAY_INSERT(cte.parent_chain, '$[0]', v.id) AS parent_chain
+      FROM (SELECT t.*, f.filename, f.use_parent
+            FROM (SELECT s.*, h.id as handle_id, h.name as handle_name
+                  FROM (voip_sound_sets s, voip_sound_handles h)
+                 ) AS t
+            LEFT JOIN voip_sound_files f ON f.handle_id = t.handle_id AND f.set_id = t.id
+           ) AS v
+      JOIN cte ON cte.set_id = v.parent_id AND cte.handle_id = v.handle_id
+)
+SELECT cte.set_id, cte.reseller_id, cte.contract_id, cte.name, cte.description,
+       cte.handle_id, cte.handle_name,
+       vsf.id as file_id, vsf.filename, vsf.loopplay,
+       REPLACE(REPLACE(REPLACE(
+          JSON_REMOVE(cte.parent_chain, '$[0]'),
+          '[', ''), ']', ''), ', ', ':'
+       ) AS parent_chain,
+       data_set_id,
+       vsf.data
+  FROM cte
+  LEFT JOIN voip_sound_files vsf ON vsf.set_id = cte.data_set_id AND vsf.handle_id = cte.handle_id;
+
+DROP TABLE voip_sound_set_handle_parents;
diff --git a/db_scripts/diff/15766.up b/db_scripts/diff/15766.up
new file mode 100644
index 00000000..c3a95b75
--- /dev/null
+++ b/db_scripts/diff/15766.up
@@ -0,0 +1,245 @@
+USE provisioning;
+
+CREATE OR REPLACE TABLE `voip_sound_set_handle_parents` (
+  `id` int(11) NOT NULL AUTO_INCREMENT,
+  `set_id` int(11) NOT NULL,
+  `handle_id` int(11) NOT NULL,
+  `parent_set_id` int(11) DEFAULT NULL,
+  `parent_chain` varchar(1024) DEFAULT NULL,
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `set_handle_id_idx` (`set_id`, `handle_id`),
+  KEY `handle_id_idx` (`handle_id`),
+  KEY `parent_set_id_idx` (`parent_set_id`),
+  CONSTRAINT `vshh_handle_id_ref` FOREIGN KEY (`handle_id`) REFERENCES `voip_sound_handles` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+
+DELIMITER ;;
+CREATE OR REPLACE PROCEDURE update_sound_set_handle_parents(IN u_sound_set_id INT, IN u_handle_id INT)
+BEGIN
+    IF u_sound_set_id IS NOT NULL THEN
+        DELETE p FROM voip_sound_set_handle_parents p
+         WHERE set_id IN (
+            WITH RECURSIVE cte as (
+                SELECT s.id
+                  FROM voip_sound_sets s
+                 WHERE id = u_sound_set_id
+                UNION
+                SELECT s.id
+                  FROM voip_sound_sets s
+                  JOIN cte ON cte.id = s.parent_id
+            )
+            SELECT id
+              FROM cte
+           )
+           AND (handle_id = u_handle_id OR 1=1);
+
+        DELETE p FROM voip_sound_set_handle_parents p
+         WHERE set_id IN (
+            WITH RECURSIVE cte as (
+                SELECT s.id, s.parent_id
+                  FROM voip_sound_sets s
+                 WHERE id = u_sound_set_id
+                UNION
+                SELECT s.id, s.parent_id
+                  FROM voip_sound_sets s
+                  JOIN cte ON cte.parent_id = s.id
+            )
+            SELECT id
+              FROM cte
+           )
+           AND (handle_id = u_handle_id OR 1=1);
+
+        INSERT INTO voip_sound_set_handle_parents(set_id, handle_id, parent_set_id, parent_chain)
+        WITH RECURSIVE cte as (
+                SELECT v.id AS set_id, v.handle_id,
+                       v.id AS data_set_id,
+                       JSON_ARRAY(v.id) AS parent_chain
+                  FROM (SELECT s.*, h.id as handle_id
+                        FROM (voip_sound_sets s, voip_sound_handles h)
+                       ) AS v
+                  LEFT JOIN voip_sound_files f ON f.handle_id = v.handle_id AND f.set_id = v.id
+            WHERE v.id = (
+                WITH RECURSIVE cte as (
+                    SELECT s.id, s.parent_id, CAST(0 as unsigned) as iter
+                      FROM voip_sound_sets s
+                     WHERE id = u_sound_set_id
+                    UNION
+                    SELECT s.id, s.parent_id, iter+1 as iter
+                      FROM voip_sound_sets s
+                      JOIN cte ON cte.parent_id = s.id
+                )
+                SELECT id
+                  FROM cte
+                 WHERE iter = (SELECT max(iter) from cte)
+            )
+            AND (v.handle_id = u_handle_id OR 1=1)
+            UNION
+            SELECT v.id AS set_id, v.handle_id,
+                   IF(f.use_parent = 0, v.id, cte.data_set_id) AS data_set_id,
+                   JSON_ARRAY_INSERT(cte.parent_chain, "$[0]", v.id) AS parent_chain
+              FROM (SELECT s.*, h.id as handle_id, h.name as handle_name
+                    FROM (voip_sound_sets s, voip_sound_handles h)
+                   ) AS v
+              LEFT JOIN voip_sound_files f ON f.handle_id = v.handle_id AND f.set_id = v.id
+              JOIN cte ON cte.set_id = v.parent_id AND cte.handle_id = v.handle_id
+        )
+        SELECT set_id, handle_id, IF(data_set_id = set_id, NULL, data_set_id) as data_set_id,
+               REPLACE(REPLACE(REPLACE(
+                JSON_REMOVE(cte.parent_chain, "$[0]"),
+                "[", ""), "]", ""), ", ", ":"
+               ) AS parent_chain
+          FROM cte;
+    ELSE
+        IF u_handle_id IS NOT NULL THEN
+            DELETE FROM voip_sound_set_handle_parents WHERE handle_id = u_handle_id;
+        ELSE
+            DELETE FROM voip_sound_set_handle_parents;
+        END IF;
+
+        INSERT INTO voip_sound_set_handle_parents(set_id, handle_id, parent_set_id, parent_chain)
+        WITH RECURSIVE cte as (
+                SELECT v.id AS set_id, v.handle_id,
+                       v.id AS data_set_id,
+                       JSON_ARRAY(v.id) AS parent_chain
+                  FROM (SELECT s.*, h.id as handle_id
+                        FROM (voip_sound_sets s, voip_sound_handles h)
+                       ) AS v
+                  LEFT JOIN voip_sound_files f ON f.handle_id = v.handle_id AND f.set_id = v.id
+                 WHERE v.parent_id IS NULL
+                   AND (v.handle_id = u_handle_id OR 1=1)
+                 UNION
+                SELECT v.id AS set_id, v.handle_id,
+                       IF(f.use_parent = 0, v.id, cte.data_set_id) AS data_set_id,
+                       JSON_ARRAY_INSERT(cte.parent_chain, "$[0]", v.id) AS parent_chain
+                  FROM (SELECT s.*, h.id as handle_id, h.name as handle_name
+                        FROM (voip_sound_sets s, voip_sound_handles h)
+                       ) AS v
+                  LEFT JOIN voip_sound_files f ON f.handle_id = v.handle_id AND f.set_id = v.id
+                  JOIN cte ON cte.set_id = v.parent_id AND cte.handle_id = v.handle_id
+        )
+        SELECT set_id, handle_id, IF(data_set_id = set_id, NULL, data_set_id) as data_set_id,
+               REPLACE(REPLACE(REPLACE(
+                JSON_REMOVE(cte.parent_chain, "$[0]"),
+                "[", ""), "]", ""), ", ", ":"
+               ) AS parent_chain
+          FROM cte;
+    END IF;
+
+END ;;
+DELIMITER ;
+
+delimiter ;;
+CREATE OR REPLACE TRIGGER voip_sound_sets_create_trig AFTER INSERT ON voip_sound_sets
+    FOR each ROW BEGIN
+
+    IF NEW.parent_id IS NOT NULL THEN
+        CALL update_sound_set_handle_parents(NEW.id, NULL);
+    END IF;
+
+END;;
+delimiter ;
+
+delimiter ;;
+CREATE OR REPLACE TRIGGER voip_sound_sets_update_trig AFTER UPDATE ON voip_sound_sets
+    FOR each ROW BEGIN
+
+    IF NOT (OLD.parent_id <=> NEW.parent_id) THEN
+        CALL update_sound_set_handle_parents(NEW.id, NULL);
+    END IF;
+
+END;;
+delimiter ;
+
+
+delimiter ;;
+CREATE OR REPLACE TRIGGER voip_sound_sets_delete_trig AFTER DELETE ON voip_sound_sets
+    FOR each ROW BEGIN
+
+    DECLARE done INT DEFAULT 0;
+    DECLARE set_id INT DEFAULT 0;
+    DECLARE x CURSOR FOR
+        SELECT DISTINCT set_id
+          FROM voip_sound_set_handle_parents
+         WHERE parent_set_id = OLD.id;
+    DECLARE continue handler FOR NOT FOUND SET done = true;
+
+    OPEN x;
+    iter: LOOP
+        FETCH x INTO set_id;
+        IF done THEN
+            LEAVE iter;
+        END IF;
+        CALL update_sound_set_handle_parents(set_id, NULL);
+    END LOOP;
+    CLOSE x;
+
+END;;
+delimiter ;
+
+
+delimiter ;;
+CREATE OR REPLACE TRIGGER voip_sound_files_create_trig AFTER UPDATE ON voip_sound_files
+    FOR each ROW BEGIN
+
+    CALL update_sound_set_handle_parents(NEW.set_id, NEW.handle_id);
+
+END;;
+delimiter ;
+
+delimiter ;;
+CREATE OR REPLACE TRIGGER voip_sound_files_update_trig AFTER UPDATE ON voip_sound_files
+    FOR each ROW BEGIN
+
+    CALL update_sound_set_handle_parents(NEW.set_id, NEW.handle_id);
+
+END;;
+delimiter ;
+
+delimiter ;;
+CREATE OR REPLACE TRIGGER voip_sound_files_delete_trig AFTER DELETE ON voip_sound_files
+    FOR each ROW BEGIN
+
+    DECLARE done INT DEFAULT 0;
+    DECLARE set_id INT DEFAULT 0;
+    DECLARE x CURSOR FOR
+        SELECT DISTINCT set_id
+          FROM voip_sound_set_handle_parents
+         WHERE parent_set_id = OLD.set_id
+           AND handle_id = OLD.handle_id;
+    DECLARE continue handler FOR NOT FOUND SET done = true;
+
+    OPEN x;
+    iter: LOOP
+        FETCH x INTO set_id;
+        IF done THEN
+            LEAVE iter;
+        END IF;
+        CALL update_sound_set_handle_parents(set_id, OLD.handle_id);
+    END LOOP;
+    CLOSE x;
+
+END;;
+delimiter ;
+
+
+CREATE OR REPLACE VIEW v_sound_set_files AS
+SELECT r.set_id, s.reseller_id, s.contract_id, s.name, s.description,
+       r.handle_id, h.name as handle_name,
+       IF(r.parent_set_id IS NOT NULL, vsf_p.id, vsf.id) as file_id,
+       IF(r.parent_set_id IS NOT NULL, vsf_p.filename, vsf.filename) as filename,
+       IF(r.parent_set_id IS NOT NULL, vsf_p.loopplay, vsf.loopplay) as loopplay,
+       REPLACE(REPLACE(REPLACE(
+          JSON_REMOVE(r.parent_chain, '$[0]'),
+          '[', ''), ']', ''), ', ', ':'
+       ) AS parent_chain,
+       r.parent_set_id as data_set_id,
+       IF(r.parent_set_id IS NOT NULL, vsf_p.data, vsf.data) as data
+  FROM voip_sound_set_handle_parents r
+  JOIN voip_sound_sets s ON s.id = r.set_id
+  JOIN voip_sound_handles h ON h.id = r.handle_id
+  LEFT JOIN voip_sound_files vsf ON vsf.set_id = r.set_id AND vsf.handle_id = r.handle_id
+  LEFT JOIN voip_sound_files vsf_p ON vsf_p.set_id = r.parent_set_id AND vsf_p.handle_id = r.handle_id;
+
+
+CALL update_sound_set_handle_parents(NULL, NULL);