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#### Description Function ps_watchers_db_timer_clean() inside src/modules/presence/subscribe.c is called repeatedly on my setup. Each time is called it performs a delete inside table watchers comparing columns inserted_time and status which are not indexed:

``` MariaDB [kamailio]> explain delete from `watchers` where `inserted_time`<1656252889 AND `status`=2; +------+-------------+----------+------+---------------+------+---------+------+------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +------+-------------+----------+------+---------------+------+---------+------+------+-------------+ | 1 | SIMPLE | watchers | ALL | NULL | NULL | NULL | NULL | 1 | Using where | +------+-------------+----------+------+---------------+------+---------+------+------+-------------+ ```

Can we consider adding an index improving performance a bit?

``` MariaDB [kamailio]> CREATE INDEX inserted_time_status_idx ON watchers (`inserted_time`, `status`); Query OK, 0 rows affected (0.015 sec) Records: 0 Duplicates: 0 Warnings: 0

MariaDB [kamailio]> explain delete from `watchers` where `inserted_time`<1656252889 AND `status`=2; +------+-------------+----------+-------+--------------------------+--------------------------+---------+------+------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +------+-------------+----------+-------+--------------------------+--------------------------+---------+------+------+-------------+ | 1 | SIMPLE | watchers | range | inserted_time_status_idx | inserted_time_status_idx | 4 | NULL | 1 | Using where | +------+-------------+----------+-------+--------------------------+--------------------------+---------+------+------+-------------+ 1 row in set (0.001 sec) ```

You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/3182

-- Commit Summary --

* kamctl:Index "inserted_time"+"status" in watchers

-- File Changes --

M utils/kamctl/mysql/presence-create.sql (2) M utils/kamctl/postgres/presence-create.sql (1)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/3182.patch https://github.com/kamailio/kamailio/pull/3182.diff