3 Commits

Author	SHA1	Message	Date
Jan Provaznik	0fc9f9d3e7	Add version 4.2 to all existing migrations ... DB schema generated by a migration may look different in rails 4 and 5 (because rails 5 may use different default values). For this reason it's important to explicitly set for which rails version a migration was written for. See https://stackoverflow.com/questions/35929869/activerecordmigration-deprecation-warning-asks-for-rails-version-but-im-no/35930912#35930912	2018-11-22 13:18:28 +01:00
Andreas Brandl	ef077fd9fd	Simplify down migration.	2018-02-20 16:40:48 +01:00
Andreas Brandl	5a5a33a9a6	Add partial index on projects for index-only scans. ... This helps with queries that get project ids based on the - comparably rare - visibility levels 10 and 20. For these, postgres can now leverage the partial index for a index-only scan to improve performance. Example queries: SELECT id FROM projects WHERE visibility_level IN (10,20) SELECT id FROM projects WHERE visibility_level IN (10) For MySQL, this results in a full index on id because MySQL omits the WHERE clause. That is, the index is a duplicate of the primary key basically.	2018-02-20 13:08:24 +01:00