Combine feasts: 2456 -> 4474 and 2094 -> 4475

[dchiller]

We need to:

• ensure that all the feast data for feasts 2456 and 2094 have been transferred to 4474 and 4475 respectively
• "re-feast" all chants and sequences that have the old feast ID's so that they have the new feast ID's
• delete the old feasts

[lucasmarchd01]

I think we can set up a management command that can do this. There's one thing I've noticed:

The feast date is different for feasts 2456 and 4474, which are August 8 and August 4, respectively. Should we use the date from the old feast (2456) or the new one (4474) when merging the data?

[annamorphism]

My understanding is that the merged feast (4474) should have the 4 August date, corresponding to the new code 14080430.

[dchiller]

I think we can set up a management command that can do this.

Great point -- I could see this as being potentially useful functionality going forward.

[lucasmarchd01]

The command has now been run successfully on staging. Once this reaches production we can run the command again and close the issue.

[dchiller]

@lucasmarchd01 Thanks! I assigned you mostly so that we could see from the issue list that this was already under control -- but thanks for testing this too!