Add tags migration 1 #96
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mxq_daemon.prerequisites should be renamed to tags. Add the new name as a new column. The old column prerequisites will be reused for another purpose. Make both columns into VARCHAR(1000) for consistency, where 1000 is an arbitary big enough number.
We want to rename prerequisites to tags. Additionally, we want a new column prerequisites with new data. However, we can't go the direct way (CHANGE COLUMN prerequisites tags...), because the running mxqd processes use the old name. Create a new column with the new name and copy the data over. We don't really care to much, if data is lost because a mxq daemon restarts during the migration phase, because the former prerequisites and now tags column is only published into the database. Additionally, fix length of prerequisites from 1024 to 1000.
Add new column tags to mxq_group and change length of prerequisites for consistency, where 1000 is an arbitary large number.
Add new column tags to mxq_groups. Additionally, fix length of prerequisites from 1024 to 1000.
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Add new columns "tags" to mxq_daemon and mxq_group table. Keep the existing columns "prerequisites"
However, we plan a new usage: "tags" is what we have (a list of keywords) and "prerequisites" is what we require from the other side (a boolean expression using the keywords).