What is the ruling concerning the prayers I performed—more than one obligatory prayer with a single ablution—after I learned that daily vaginal discharge invalidates ablution and necessitates performing ablution for each prayer, and must I make them up?

If you suffer from continuous discharge ( سلس الرطوبات ) and have emulated the Maliki school, which does not necessitate ablution for every prayer for someone afflicted with incontinence, then your previous prayers are valid. However, if you prayed believing that ablution is required for every prayer, and you emulated the majority of scholars without a valid interpretation or permissible emulation, then you must repeat those prayers to the best of your estimation to clear your conscience. Transitioning from one madhhab to another is permissible, provided that the intention is not manipulation or undue leniency.