82d5af2dfb
### Description This fixes various problems in legacy migrations that were preventing a successful database migration from Airtime 2.5.1. Previously, following [the procedure](https://libretime.org/docs/admin-manual/install/migrate-from-airtime/) using the migrations provided in the Libretime 4.2.0 installer, without the fixes in this PR, would either fail completely, or cause all of the imported data to be completely deleted. _migrations.py If schema_version is not found in the table cc_prefs, it then checks for system_version to have a value of '2.5.1' (in case this is an airtime 2.5.1 migration which will not have any schema_version in cc_pref). If found, it prevents loading of the schema file, which is critical to preserving the imported Airtime data. 0006_2_5_5 Removed a redundant addition of the image_path and description columns to cc_show (done in earlier migration 003_2_5_2) 0015_2_5_17 Fixed a syntax error with adding the artwork column to cc_files 0023_3_0_0_alpha_9_1 Removed a redundant addition of the artwork column to cc_files (done in earlier migration 0015_2_5_7) ### Documentation Changes The [airtime migration documentation](https://libretime.org/docs/admin-manual/install/migrate-from-airtime/) already suggests a procedure to be followed, it just didn't work because of problems within these migrations. The procedure as documented should now work for those coming from Airtime 2.5.1. ### Testing Notes **What I did:** I attempted to migrate an actual airtime 2.5.1 database from a production system containing a large amount of shows, tracks, and users. I observed that the migration completed without errors, and that the expected system state was achieved within Libretime. Specifically, the calendar, library, authentication, and other aspects are populated with the data that was present in the migrated Airtime database, and Libretime is able to function using this data. **How you can replicate my testing:** Install Libretime 4.2.0. Restore a sample postrgresql database backup from an Airtime 2.5.1 server. Apply the database migration. Restart the services. Login and view the library, calender, etc. ### **Links** Closes: #3121 May also be related to, or even close (as a duplicate): #2563
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