Add AI search to existing application

Automated excerpt

On search, embed the search term the same way and ask the database which rows are closest. Now search that same list for "groceries". Step 3: Search with the same model The search term goes through the exact same embedding call as the stored text. Substring search gets that right every time. Backfill the rows that have no embedding The search query skips rows where embedding is null, so a todo without an embedding is invisible to AI search.

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