first implementation

backend/target/classes/db/migration/V1__initial_schema.sql

@@ -0,0 +1,33 @@
+-- ============================================================
+-- V1: Initial schema
+-- Spring AI manages the vector_store table separately.
+-- ============================================================
+
+CREATE TABLE IF NOT EXISTS book (
+    id               UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    title            VARCHAR(500) NOT NULL,
+    file_name        VARCHAR(500) NOT NULL,
+    file_size_bytes  BIGINT NOT NULL,
+    page_count       INT,
+    status           VARCHAR(20) NOT NULL DEFAULT 'PENDING',
+    error_message    TEXT,
+    uploaded_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
+    processed_at     TIMESTAMPTZ
+);
+
+CREATE TABLE IF NOT EXISTS chat_session (
+    id         UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    topic_id   VARCHAR(100),
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE IF NOT EXISTS message (
+    id         UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    session_id UUID NOT NULL REFERENCES chat_session(id) ON DELETE CASCADE,
+    role       VARCHAR(10) NOT NULL,
+    content    TEXT NOT NULL,
+    sources    JSONB,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX IF NOT EXISTS idx_message_session ON message(session_id, created_at);

backend/target/classes/db/migration/V2__pgvector_store.sql

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+-- ============================================================
+-- V2: pgvector extension + Spring AI vector_store table
+-- Replaces Spring AI's initialize-schema=true (which requires
+-- CREATE SCHEMA privilege and fails on restricted users).
+-- ============================================================
+
+CREATE EXTENSION IF NOT EXISTS vector;
+
+CREATE TABLE IF NOT EXISTS vector_store (
+    id        uuid      DEFAULT gen_random_uuid() PRIMARY KEY,
+    content   text,
+    metadata  json,
+    embedding vector(1536)
+);
+
+CREATE INDEX IF NOT EXISTS spring_ai_vector_index
+    ON vector_store USING hnsw (embedding vector_cosine_ops);