-| Field | Description | Type | Null | Key | Default | Extra |
-| ----- | ----------- | ---- | ---- | --- | ------- | ----- |
-| id | | int unsigned | YES | PRI | NULL | auto_increment |
-| uri-id | Id of the item-uri table entry that contains the item uri | int unsigned | YES | | NULL | |
-| parent-uri-id | Id of the item-uri table that contains the parent uri | int unsigned | NO | | NULL | |
-| thr-parent-id | Id of the item-uri table that contains the thread parent uri | int unsigned | NO | | NULL | |
-| external-id | Id of the item-uri table entry that contains the external uri | int unsigned | NO | | NULL | |
-| created | Creation timestamp. | datetime | YES | | 0001-01-01 00:00:00 | |
-| edited | Date of last edit (default is created) | datetime | YES | | 0001-01-01 00:00:00 | |
-| received | datetime | datetime | YES | | 0001-01-01 00:00:00 | |
-| gravity | | tinyint unsigned | YES | | 0 | |
-| network | Network from where the item comes from | char(4) | YES | | | |
-| owner-id | Link to the contact table with uid=0 of the owner of this item | int unsigned | YES | | 0 | |
-| author-id | Link to the contact table with uid=0 of the author of this item | int unsigned | YES | | 0 | |
-| causer-id | Link to the contact table with uid=0 of the contact that caused the item creation | int unsigned | NO | | NULL | |
-| post-type | Post type (personal note, image, article, ...) | tinyint unsigned | YES | | 0 | |
-| post-reason | Reason why the post arrived at the user | tinyint unsigned | YES | | 0 | |
-| vid | Id of the verb table entry that contains the activity verbs | smallint unsigned | NO | | NULL | |
-| private | 0=public, 1=private, 2=unlisted | tinyint unsigned | YES | | 0 | |
-| global | | boolean | YES | | 0 | |
-| visible | | boolean | YES | | 0 | |
-| deleted | item has been marked for deletion | boolean | YES | | 0 | |
-| uid | Owner id which owns this copy of the item | mediumint unsigned | YES | | NULL | |
-| protocol | Protocol used to deliver the item for this user | tinyint unsigned | NO | | NULL | |
-| contact-id | contact.id | int unsigned | YES | | 0 | |
-| event-id | Used to link to the event.id | int unsigned | NO | | NULL | |
-| unseen | post has not been seen | boolean | YES | | 1 | |
-| hidden | Marker to hide the post from the user | boolean | YES | | 0 | |
-| notification-type | | tinyint unsigned | YES | | 0 | |
-| wall | This item was posted to the wall of uid | boolean | YES | | 0 | |
-| origin | item originated at this site | boolean | YES | | 0 | |
-| psid | ID of the permission set of this post | int unsigned | NO | | NULL | |
+Fields
+------
+
+| Field | Description | Type | Null | Key | Default | Extra |
+| ----------------- | --------------------------------------------------------------------------------- | ------------------ | ---- | --- | ------------------- | -------------- |
+| id | | int unsigned | NO | PRI | NULL | auto_increment |
+| uri-id | Id of the item-uri table entry that contains the item uri | int unsigned | NO | | NULL | |
+| parent-uri-id | Id of the item-uri table that contains the parent uri | int unsigned | YES | | NULL | |
+| thr-parent-id | Id of the item-uri table that contains the thread parent uri | int unsigned | YES | | NULL | |
+| external-id | Id of the item-uri table entry that contains the external uri | int unsigned | YES | | NULL | |
+| created | Creation timestamp. | datetime | NO | | 0001-01-01 00:00:00 | |
+| edited | Date of last edit (default is created) | datetime | NO | | 0001-01-01 00:00:00 | |
+| received | datetime | datetime | NO | | 0001-01-01 00:00:00 | |
+| gravity | | tinyint unsigned | NO | | 0 | |
+| network | Network from where the item comes from | char(4) | NO | | | |
+| owner-id | Link to the contact table with uid=0 of the owner of this item | int unsigned | NO | | 0 | |
+| author-id | Link to the contact table with uid=0 of the author of this item | int unsigned | NO | | 0 | |
+| causer-id | Link to the contact table with uid=0 of the contact that caused the item creation | int unsigned | YES | | NULL | |
+| post-type | Post type (personal note, image, article, ...) | tinyint unsigned | NO | | 0 | |
+| post-reason | Reason why the post arrived at the user | tinyint unsigned | NO | | 0 | |
+| vid | Id of the verb table entry that contains the activity verbs | smallint unsigned | YES | | NULL | |
+| private | 0=public, 1=private, 2=unlisted | tinyint unsigned | NO | | 0 | |
+| global | | boolean | NO | | 0 | |
+| visible | | boolean | NO | | 0 | |
+| deleted | item has been marked for deletion | boolean | NO | | 0 | |
+| uid | Owner id which owns this copy of the item | mediumint unsigned | NO | | NULL | |
+| protocol | Protocol used to deliver the item for this user | tinyint unsigned | YES | | NULL | |
+| contact-id | contact.id | int unsigned | NO | | 0 | |
+| event-id | Used to link to the event.id | int unsigned | YES | | NULL | |
+| unseen | post has not been seen | boolean | NO | | 1 | |
+| hidden | Marker to hide the post from the user | boolean | NO | | 0 | |
+| notification-type | | smallint unsigned | NO | | 0 | |
+| wall | This item was posted to the wall of uid | boolean | NO | | 0 | |
+| origin | item originated at this site | boolean | NO | | 0 | |
+| psid | ID of the permission set of this post | int unsigned | YES | | NULL | |
+
+Indexes
+------------
+
+| Name | Fields |
+| -------------------- | ----------------------- |
+| PRIMARY | id |
+| uid_uri-id | UNIQUE, uid, uri-id |
+| uri-id | uri-id |
+| parent-uri-id | parent-uri-id |
+| thr-parent-id | thr-parent-id |
+| external-id | external-id |
+| owner-id | owner-id |
+| author-id | author-id |
+| causer-id | causer-id |
+| vid | vid |
+| contact-id | contact-id |
+| event-id | event-id |
+| psid | psid |
+| author-id_uid | author-id, uid |
+| author-id_received | author-id, received |
+| parent-uri-id_uid | parent-uri-id, uid |
+| uid_wall_received | uid, wall, received |
+| uid_contactid | uid, contact-id |
+| uid_unseen_contactid | uid, unseen, contact-id |
+| uid_unseen | uid, unseen |
+| uid_hidden_uri-id | uid, hidden, uri-id |
+
+Foreign Keys
+------------
+
+| Field | Target Table | Target Field |
+|-------|--------------|--------------|
+| uri-id | [item-uri](help/database/db_item-uri) | id |
+| parent-uri-id | [item-uri](help/database/db_item-uri) | id |
+| thr-parent-id | [item-uri](help/database/db_item-uri) | id |
+| external-id | [item-uri](help/database/db_item-uri) | id |
+| owner-id | [contact](help/database/db_contact) | id |
+| author-id | [contact](help/database/db_contact) | id |
+| causer-id | [contact](help/database/db_contact) | id |
+| vid | [verb](help/database/db_verb) | id |
+| uid | [user](help/database/db_user) | uid |
+| contact-id | [contact](help/database/db_contact) | id |
+| event-id | [event](help/database/db_event) | id |
+| psid | [permissionset](help/database/db_permissionset) | id |