- Patch #890128 by carlos8f, sumitk: comment body missing if comment module enabled after a content type module.

#358437 follow-up by David_Rothstein, sun, chx: Disallow invalid text format IDs; force 0 and non-existant formats to NULL.

#890210 by Manuel Garcia, Sutharsan, bjaspan: Fixed Cannot enable Comment module after a Drupal 6 to Drupal 7 upgrade.

- Patch #877690 by catch, das-peter, mfer, Damien Tournoud: cannot upgrade Drupal core if the comment module is enabled.

- Patch #880132 by bojanz: hook_schema() doesn't support compound foreign keys; inconsistent implementations in core.

- Patch #682552 by mradcliffe, jhodgdon: FieldException when trying to enable blog and comment modules for first time.

- Patch #743804 by gpk: comment_enable() should use node created time not changed time for last_comment_timestamp().

#314349 by mfb, Damien Tournoud, catch, scor, cha0s: Fixed random failures from comment paging tests.

#211182 by Damien Tournoud, David_Rothstein, clemens.tolboom, scor, hunmonk, et al: Allow updates to specify dependencies to ensure they run in a predictable order.

- Patch #563106 by adrian, David_Rothstein: more upgrade path fixes to help contrib updates make progress.

#538164 by scor, catch, linclark, effulgentsia, and yched: Convert Comment body as field. Yes, this is WAY past API freeze. :( But is a required follow-up for RDFa support.

- Patch #502190 by jhodgdon, stella, sun: hook implementation headers out of compliance with standards.

- Patch #292984 by sun: add cid to node_comment_statistics() for Views support and simplification of the code.

- Patch #275368 by michaelfavia, sun, mattconnolly: allow disabling comment preview + unify with node preview settings.

- Patch #470242 by yched, bjaspan: fixed namespacing for bundle names to avoid users rendering their site unusable.

- Patch #122098 by Damien Tournoud, catch, mdixoncm: split comment.timestamp into 'created' and 'changed' columns, just like for nodes.

#564394 by Berdir and Crell: Removed database BC layer. nah nah nah nah... hey hey hey... gooood byeeee...

- Patch #306151 by agentrickard, David_Rothstein, Dave Reid, dbabbage, moshe weitzman: automatically install/uninstall schema.

#289504 by mikeryan and moshe weitzman: Add index on comment, uid columns to speed up user_delete().

- Patch #336483 by brianV: SELECT MAX(comment_count) FROM node_comment_statistics did a full table scan so added an index.

- Patch #491556 by Berdir: completed converting core to DBTNG. Oh my. Kudos to Berdir for this humongous effort.