"Verbatim" search. Exact matching. Do not lean on built in FTS logic

[iansinnott]

See comment from the chrome store: https://chromewebstore.google.com/detail/gfmbnlbnapjmffgcnbopfgmflmlfghel/reviews/e4eb8dea-c6f0-47a5-966b-ee71bb3fa1cb

I definitely like the idea of giving everyone more options to search their history. The current behavior is related to how FTS works in sqlite and postgres (that review was from the sqlite version, but the same stemming logic applies in PG too).