* Implement basic scheme CRUD endpoints.
* Get All Schemes (Paged) Endpoint and store plumbing.
* Add get teams/channels for schemes.
* Fix unit tests.
* Review fixes.
* More review fixes.
* Add Scheme model and stub store.
* Port ChannelStore to be Scheme aware.
* Make almost all the API/APP layer work with ChannelSchemes.
Only thing still hacky is UpdateChannelMemberRoles().
* Add basic SchemeStore implementation.
* Migrate UpdateChannelMemberRoles properly and fix tests.
* Update store tests and mocks so they work.
* Include creating default roles in Scheme create store function.
* Implement role deletion and start scheme deletion.
* Only use non-deleted roles for authorization.
* Add GetByScheme method to Team store.
* Add GetChannelsByScheme.
* Update store mocks.
* Implement scheme deletion in the store.
* Rename is valid function.
* Add offset and limit to queries to fetch teams and channels by scheme.
* Fix queries.
* Implement scheme awareness in Team store and add a migration.
* Tidy up ChannelStore mapping functions and add exhaustive unit tests.
* Add all missing i18n.
* Proper tests for TeamStore internal functions and fix them.
* Make additional TeamMember fields nullable.
* Make new ChannelMember fields nullable.
* Create new nullable columns without defaults.
* Make new fields in large tables nullalble.
* Fix empty list of TeamMembers.
* Deduplicate SQL queries.
* Fix spelling.
* Fix review comment.
* More review fixes.
* More review fixes.
* XYZ-13: Update Permission and Role structs to new design.
* XYZ-10: Role store.
* XYZ-9/XYZ-44: Roles API endpoints and WebSocket message.
* XYZ-8: Switch server permissions checks to store backed roles.
* XYZ-58: Proper validation of roles where required.
* XYZ-11/XYZ-55: Migration to store backed roles from policy config.
* XYZ-37: Update unit tests to work with database roles.
* XYZ-56: Remove the "guest" role.
* Changes to SetDefaultRolesFromConfig.
* Short-circuit the store if nothing has changed.
* Address first round of review comments.
* Address second round of review comments.
* Created message export scheduled task
* Added CLI command to immediately kick off an export job
* Added email addresses for users joining and leaving the channel to the export
* Added support for both MySQL and PostgreSQL
* Fixing gofmt error
* Added a new ChannelMemberHistory store and associated tests
* Updating the ChannelMemberHistory channel as users create/join/leave channels
* Added user email to the message export object so it can be included in the actiance export xml
* Don't fail to log a leave event if a corresponding join event wasn't logged
* Adding copyright notices
* Adding message export settings to daily diagnostics report
* Added System Console integration for message export
* Cleaned up TODOs
* Made batch size configurable
* Added export from timestamp to CLI command
* Made ChannelMemberHistory table updates best effort
* Added a context-based timeout option to the message export CLI
* Minor PR updates/improvements
* Removed unnecessary fields from MessageExport object to reduce query overhead
* Removed JSON functions from the message export query in an effort to optimize performance
* Changed the way that channel member history queries and purges work to better account for edge cases
* Fixing a test I missed with the last refactor
* Added file copy functionality to file backend, improved config validation, added default config values
* Fixed file copy tests
* More concise use of the testing libraries
* Fixed context leak error
* Changed default export path to correctly place an 'export' directory under the 'data' directory
* Can't delete records from a read replica
* Fixed copy file tests
* Start job workers when license is applied, if configured to do so
* Suggestions from the PR
* Moar unit tests
* Fixed test imports
