Extension:CodeReview/code prop changes table

mysql> describe code_prop_changes;
+---------------+----------------+------+-----+----------------+-------+
| Field         | Type           | Null | Key | Default        | Extra |
+---------------+----------------+------+-----+----------------+-------+
| cpc_repo_id   | int(11)        | NO   | MUL | NULL           |       |
| cpc_rev_id    | int(11)        | NO   |     | NULL           |       |
| cpc_attrib    | varbinary(10)  | NO   |     | NULL           |       |
| cpc_removed   | blob           | YES  |     | NULL           |       |
| cpc_added     | blob           | YES  |     | NULL           |       |
| cpc_timestamp | binary(14)     | NO   |     |                |       |
| cpc_user      | int(11)        | NO   |     | NULL           |       |
| cpc_user_text | varbinary(255) | NO   |     | NULL           |       |
+---------------+----------------+------+-----+----------------+-------+