initial commit: create basic rag search and ingest

backend/migrations/2025-01-03-0001-add-searchable-content.sql

@@ -0,0 +1,8 @@
+CREATE TABLE searchable_content (
+                                    trackingid TEXT NOT NULL,
+                                    content TEXT NOT NULL,
+                                    full_emb F32_BLOB(1536) NOT NULL,
+                                    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX emb_idx ON searchable_content (libsql_vector_idx(full_emb));