initial commit

migrations/20241107141344_documents.sql

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+CREATE TABLE documents (
+    id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+    book_id BIGINT NOT NULL,
+    version INTEGER NOT NULL,
+    text_chunk TEXT NOT NULL,
+    embedding vector(384) NOT NULL 
+);
+
+CREATE INDEX ON documents 
+USING ivfflat (embedding vector_cosine_ops)
+WITH (lists = 100);