Extension:ContentTranslation/cx_translations table
mysql> describe cx_translations;
+------------------------------------+-------------------------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+------------------------------------+-------------------------------------+------+-----+---------+----------------+
| translation_id | int(11) | NO | PRI | NULL | auto_increment |
| translation_source_title | varbinary(512) | NO | MUL | NULL | |
| translation_target_title | varbinary(512) | NO | | NULL | |
| translation_source_language | varbinary(36) | NO | MUL | NULL | |
| translation_target_language | varbinary(36) | NO | | NULL | |
| translation_source_revision_id | int(10) unsigned | YES | | NULL | |
| translation_target_revision_id | int(10) unsigned | YES | | NULL | |
| translation_source_url | blob | NO | | NULL | |
| translation_target_url | blob | YES | | NULL | |
| translation_status | enum('draft','published','deleted') | YES | | NULL | |
| translation_start_timestamp | varbinary(14) | NO | | NULL | |
| translation_last_updated_timestamp | varbinary(14) | NO | | NULL | |
| translation_progress | tinyblob | NO | | NULL | |
| translation_started_by | int(11) | YES | | NULL | |
| translation_last_update_by | int(11) | YES | | NULL | |
| translation_cx_version | tinyint(3) unsigned | YES | | 1 | |
+------------------------------------+-------------------------------------+------+-----+---------+----------------+