diff --git a/db_scripts/diff/15795.down b/db_scripts/diff/15795.down
new file mode 100644
index 00000000..626a9fad
--- /dev/null
+++ b/db_scripts/diff/15795.down
@@ -0,0 +1,190 @@
+USE provisioning;
+
+
+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 = u_sound_set_id
+           AND NOT EXISTS (SELECT id
+                             FROM voip_sound_sets
+                            WHERE id = u_sound_set_id);
+
+        IF u_handle_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;
+
+            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,
+                           CAST('' AS CHAR(4096)) AS parent_chain,
+                           CAST(0 as unsigned) AS affected
+                  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
+                 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,
+                       CONCAT(v.parent_id, IF(LENGTH(cte.parent_chain) > 1, ':', ''), cte.parent_chain) as parent_chain,
+                       IF(v.id = u_sound_set_id OR v.parent_id = u_sound_set_id OR affected = 1, 1, 0)
+                  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,
+                   parent_chain
+              FROM cte
+             WHERE set_id = u_sound_set_id OR affected = 1;
+        ELSE
+            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
+             );
+
+            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,
+                           CAST('' AS CHAR(4096)) AS parent_chain,
+                           CAST(0 as unsigned) AS affected
+                  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)
+                 )
+                 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,
+                       CONCAT(v.parent_id, IF(LENGTH(cte.parent_chain) > 1, ':', ''), cte.parent_chain) as parent_chain,
+                       IF(v.id = u_sound_set_id OR v.parent_id = u_sound_set_id OR affected = 1, 1, 0)
+                  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,
+                   parent_chain
+              FROM cte
+             WHERE set_id = u_sound_set_id OR affected = 1;
+        END IF;
+    ELSE
+        IF u_handle_id IS NOT NULL THEN
+            DELETE FROM voip_sound_set_handle_parents WHERE handle_id = u_handle_id;
+
+            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,
+                           CAST('' AS CHAR(4096)) 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
+                     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,
+                           CONCAT(v.parent_id, IF(LENGTH(cte.parent_chain) > 1, ':', ''), cte.parent_chain) 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,
+                   parent_chain
+              FROM cte;
+        ELSE
+            DELETE FROM voip_sound_set_handle_parents;
+
+            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,
+                           CAST('' AS CHAR(4096)) 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
+                     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,
+                           CONCAT(v.parent_id, IF(LENGTH(cte.parent_chain) > 1, ':', ''), cte.parent_chain) 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,
+                   parent_chain
+              FROM cte;
+        END IF;
+    END IF;
+
+END ;;
+DELIMITER ;
+
diff --git a/db_scripts/diff/15795.up b/db_scripts/diff/15795.up
new file mode 100644
index 00000000..b0072b44
--- /dev/null
+++ b/db_scripts/diff/15795.up
@@ -0,0 +1,265 @@
+USE provisioning;
+
+
+DELIMITER ;;
+CREATE OR REPLACE PROCEDURE update_sound_set_handle_parents(IN u_sound_set_id INT, IN u_handle_id INT)
+BEGIN
+    /* declare */
+    DECLARE done INT DEFAULT FALSE;
+
+
+    DECLARE x_set_id INT DEFAULT 0;
+    DECLARE x_handle_id INT DEFAULT 0;
+    DECLARE x_parent_set_id INT DEFAULT NULL;
+    DECLARE x_parent_chain VARCHAR(255) DEFAULT '';
+
+
+    /* u_sound_set_id and u_handle_id */
+    DECLARE x_sound_set_handle CURSOR FOR
+        WITH RECURSIVE cte as (
+            SELECT v.id AS set_id, v.handle_id,
+                       v.id AS data_set_id,
+                       CAST('' AS CHAR(4096)) AS parent_chain,
+                       CAST(0 as unsigned) AS affected
+              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
+             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,
+                   CONCAT(v.parent_id, IF(LENGTH(cte.parent_chain) > 1, ':', ''), cte.parent_chain) as parent_chain,
+                   IF(v.id = u_sound_set_id OR v.parent_id = u_sound_set_id OR affected = 1, 1, 0)
+              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 parent_set_id,
+               parent_chain
+          FROM cte
+         WHERE set_id = u_sound_set_id OR affected = 1;
+
+
+    /* u_sound_set_id */
+    DECLARE x_sound_set CURSOR FOR
+        WITH RECURSIVE cte as (
+            SELECT v.id AS set_id, v.handle_id,
+                       v.id AS data_set_id,
+                       CAST('' AS CHAR(4096)) AS parent_chain,
+                       CAST(0 as unsigned) AS affected
+              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)
+             )
+             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,
+                   CONCAT(v.parent_id, IF(LENGTH(cte.parent_chain) > 1, ':', ''), cte.parent_chain) as parent_chain,
+                   IF(v.id = u_sound_set_id OR v.parent_id = u_sound_set_id OR affected = 1, 1, 0)
+              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 parent_set_id,
+               parent_chain
+          FROM cte
+         WHERE set_id = u_sound_set_id OR affected = 1;
+
+
+
+    /* u_handle_id */
+    DECLARE x_handle CURSOR FOR
+        WITH RECURSIVE cte as (
+                SELECT v.id AS set_id, v.handle_id,
+                       v.id AS data_set_id,
+                       CAST('' AS CHAR(4096)) 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
+                 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,
+                       CONCAT(v.parent_id, IF(LENGTH(cte.parent_chain) > 1, ':', ''), cte.parent_chain) 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 parent_set_id,
+               parent_chain
+          FROM cte;
+
+
+    /* none */
+    DECLARE x CURSOR FOR
+        WITH RECURSIVE cte as (
+                SELECT v.id AS set_id, v.handle_id,
+                       v.id AS data_set_id,
+                       CAST('' AS CHAR(4096)) 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
+                 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,
+                       CONCAT(v.parent_id, IF(LENGTH(cte.parent_chain) > 1, ':', ''), cte.parent_chain) 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 parent_set_id,
+               parent_chain
+          FROM cte;
+
+
+    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=TRUE;
+
+
+    /* code */
+    IF u_sound_set_id IS NOT NULL THEN
+        DELETE p FROM voip_sound_set_handle_parents p
+         WHERE set_id = u_sound_set_id
+           AND NOT EXISTS (SELECT id
+                             FROM voip_sound_sets
+                            WHERE id = u_sound_set_id);
+
+        IF u_handle_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;
+
+            OPEN x_sound_set_handle;
+            iter: LOOP
+                FETCH x_sound_set_handle INTO x_set_id, x_handle_id, x_parent_set_id, x_parent_chain;
+                IF done THEN
+                    LEAVE iter;
+                END IF;
+                INSERT INTO voip_sound_set_handle_parents
+                    (set_id, handle_id, parent_set_id, parent_chain)
+                VALUES
+                    (x_set_id, x_handle_id, x_parent_set_id, x_parent_chain);
+            END LOOP;
+            CLOSE x_sound_set_handle;
+        ELSE
+            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
+             );
+
+            OPEN x_sound_set;
+            iter: LOOP
+                FETCH x_sound_set INTO x_set_id, x_handle_id, x_parent_set_id, x_parent_chain;
+                IF done THEN
+                    LEAVE iter;
+                END IF;
+                INSERT INTO voip_sound_set_handle_parents
+                    (set_id, handle_id, parent_set_id, parent_chain)
+                VALUES
+                    (x_set_id, x_handle_id, x_parent_set_id, x_parent_chain);
+            END LOOP;
+            CLOSE x_sound_set;
+        END IF;
+    ELSE
+        IF u_handle_id IS NOT NULL THEN
+            DELETE FROM voip_sound_set_handle_parents WHERE handle_id = u_handle_id;
+
+            OPEN x_handle;
+            iter: LOOP
+                FETCH x_handle INTO x_set_id, x_handle_id, x_parent_set_id, x_parent_chain;
+                IF done THEN
+                    LEAVE iter;
+                END IF;
+                INSERT INTO voip_sound_set_handle_parents
+                    (set_id, handle_id, parent_set_id, parent_chain)
+                VALUES
+                    (x_set_id, x_handle_id, x_parent_set_id, x_parent_chain);
+            END LOOP;
+            CLOSE x_handle;
+        ELSE
+            DELETE FROM voip_sound_set_handle_parents;
+
+            OPEN x;
+            iter: LOOP
+                FETCH x INTO x_set_id, x_handle_id, x_parent_set_id, x_parent_chain;
+                IF done THEN
+                    LEAVE iter;
+                END IF;
+                INSERT INTO voip_sound_set_handle_parents
+                    (set_id, handle_id, parent_set_id, parent_chain)
+                VALUES
+                    (x_set_id, x_handle_id, x_parent_set_id, x_parent_chain);
+            END LOOP;
+            CLOSE x;
+        END IF;
+    END IF;
+
+END ;;
+DELIMITER ;
+