Extension:BetaFeatures/betafeatures user counts table

feature
Primary key.

number
...

Schema
mysql> describe betafeatures_user_counts; +-++--+-+-+---+ +-++--+-+-+---+ +-++--+-+-+---+
 * Field  | Type           | Null | Key | Default | Extra |
 * feature | varbinary(255) | NO  | PRI | NULL    |       |
 * number | int(11)        | NO   |     | 0       |       |

Indexes
+--++--+--+-+---+-+--++--++-+---+ +--++--+--+-+---+-+--++--++-+---+ +--++--+--+-+---+-+--++--++-+---+
 * Table                   | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
 * betafeatures_user_counts |         0 | PRIMARY  |            1 | feature     | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |