Extension:BounceHandler/bounce records table

The bounce_records table contains the bounce handling records

Schema
+---+--+--+-+-++ +---+--+--+-+-++ +---+--+--+-+-++
 * Field        | Type             | Null | Key | Default | Extra          |
 * br_id        | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
 * br_user_email | varbinary(255)  | NO   | MUL | NULL    |                |
 * br_timestamp | binary(14)       | NO   | MUL | NULL    |                |
 * br_reason    | varbinary(255)   | NO   |     | NULL    |                |

Indexes
+++---+--+---+---+-+--++--++-+---+ +++---+--+---+---+-+--++--++-+---+ +++---+--+---+---+-+--++--++-+---+
 * Table         | Non_unique | Key_name          | Seq_in_index | Column_name   | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
 * bounce_records |         0 | PRIMARY           |            1 | br_id         | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
 * bounce_records |         1 | br_mail_timestamp |            1 | br_user_email | A         |           0 |       50 | NULL   |      | BTREE      |         |               |
 * bounce_records |         1 | br_mail_timestamp |            2 | br_timestamp  | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
 * bounce_records |         1 | br_timestamp      |            1 | br_timestamp  | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |