| unknown | if sender not in the contact table this is 1 | varchar(255) | NO | | 0 | |
| uri | | varchar(255) | NO | MUL | | |
| parent-uri | | varchar(255) | NO | MUL | | |
-| created | creation time of the private message | datetime | NO | | 0000-00-00 00:00:00 | |
+| created | creation time of the private message | datetime | NO | | 0001-01-01 00:00:00 | |
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