agent build

migrations/000008_knowledge.down.sql

@@ -0,0 +1,21 @@
+-- Reverses 000008.
+--
+-- Drops the two tables and the similarity function. Chunks go with their
+-- documents by CASCADE, and both tables' indexes go with them.
+--
+-- Rolling this back destroys the index, not the sources. Documents were
+-- ingested FROM somewhere — a policy store, an upload, a file — and this table
+-- is a derived copy, so the cost of reversing is a re-ingest and a re-embed
+-- rather than lost content. The re-embed is the expensive half, and it is worth
+-- saying out loud before anyone runs this in an environment where embedding
+-- costs money.
+--
+-- Order matters: the function is dropped last because nothing depends on it,
+-- and the tables are dropped before it only so that a partially-applied
+-- rollback leaves no table referencing a missing function.
+
+SET search_path = public;
+
+DROP TABLE IF EXISTS public.knowledge_chunks;
+DROP TABLE IF EXISTS public.knowledge_documents;
+DROP FUNCTION IF EXISTS public.knowledge_dot(real[], real[]);