This fort is in related to issue 0012673 in the Dwarf Fortress bug tracker. There are 4 saves.

• region13 -- 1st Galena, late summer, 150
• autosave 2 -- 1st Granite, early spring, 150
• autosave 1 -- 1st Limestone, early autumn, 149
• autosave 3 -- 1st Granite, early spring, 149

The issue started in Mid-Spring 150.

In Late Autumn Year 149 on the 22nd of Timber, the residency petition of Ini Futurebathes was approved. Upon observation that Ini's mood was the worst in the fort, they were expelled on the 19th of Moonstone, Early Winter 149. On the 7th of Granite, Early Spring 150, Cudal Tacticsprial petitioned for residency. Cudal was denied their request on the 10th of Slate Mid-Spring 150. 17th Slate Mid-Spring 150, Ina Spikewilt arrived and petitioned for residency and this is the point that the issue starts. Every petition after this moment generates hundreds of petitions.