Revert "Add StorageModel"

This reverts commit 8f6872ccc0622654a943a534be10bc06f4c586b8.
Revert "Refine"

This reverts commit 1d12ddfb17a0a3ab563b859ce67edfa8f0bcbf6e.
Revert "Refine data structure"

This reverts commit d1dc5d63f02c55665a52deeca64a01efde0a6d49.
Revert "Refine data structure, add VoteOption and VoteTrigger for separate table"

This reverts commit 61361adc2d2473d190ef18327ac4044d860d1792.