I spent also some time to think about how to provide lyrics to the band with their different demands. Sometimes only the correct lyrics without further formatting will do nicely (e. g. for our singers), but coming to bars or odd time signatures may become more important for rhythmn guitars and bass, while having an idea of the melody is also of good usability when the solo guitarist want to follow along the lyric melody. All three demands or usecases need a different information density. So, finally I decided to write a Word document formatted with a big table with subdivisions of fours (where applicable) or diviations (where necessary).
Only "important" parts of the lyrics get tabs with the melody, which on the other hand can pump the doc up to several pages easily, which is not what I originally wanted to have: a max. 2 pager that contain all the necessary information for that song. Key, tempo, bars, lyrics and chords. Not all information (e. g., all transcibed stems), but all necessary information to be able to recall the missing information to play the song on the fly and good enough for the audience to enjoy. This is definitely a task that need to take account of what musical knowledge the individual band members have, which instrument they play, how they individually "learn" structures, and what they need to be able to remember the song (in case it got forgotten).
In this respect we're all different. I myself like to know when a lyric need to be sung (by the vocalists) and what pitch it should then has (because I cannot sing and also cannot hear very well, nor can I quickly read music. I need to prepare in advance with information on the sheet that enables me to move through the song (until I can play it by heart, of course).
Hm, maybe not exactly the most demanded usecase for your lyrics database :-)