Table hook
===========
addon hook registry

| Field | Description | Type | Null | Key | Default | Extra |
| ----- | ----------- | ---- | ---- | --- | ------- | ----- |
| id       | sequential ID                                                                                              | int unsigned      | NO | PRI | NULL | auto_increment |    
| hook     | name of hook                                                                                               | varbinary(100)    | NO |     |      |                |    
| file     | relative filename of hook handler                                                                          | varbinary(200)    | NO |     |      |                |    
| function | function name of hook handler                                                                              | varbinary(200)    | NO |     |      |                |    
| priority | not yet implemented - can be used to sort conflicts in hook handling by calling handlers in priority order | smallint unsigned | NO |     | 0    |                |    

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