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When you change a database so that the tables have a prefix, you end up getting a 'duplicate key' error when creating new nodes or other itmes.
This is because Drupal maintains a 'sequences' table that stores the autoincrement values for various tables. This table has a structure of:
| name | id |
|---|---|
| files_fid | 114 |
| files_fid | 55 |
| menu_mid | 120 |
| vocabulary_vid | 42 |
| term_data_tid | 38 |
| users_uid | 6 |