friendica/doc/database/db_locks.md

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Table locks
===========
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Fields
------
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| Field | Description | Type | Null | Key | Default | Extra |
| ------- | ---------------------------- | ------------ | ---- | --- | ------------------- | -------------- |
| id | sequential ID | int unsigned | NO | PRI | NULL | auto_increment |
| name | | varchar(128) | NO | | | |
| locked | | boolean | NO | | 0 | |
| pid | Process ID | int unsigned | NO | | 0 | |
| expires | datetime of cache expiration | datetime | NO | | 0001-01-01 00:00:00 | |
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Indexes
------------
| Name | Fields |
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|------|--------|
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| PRIMARY | id |
| name_expires | name, expires |
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