backend barebone done, big chunk of work done

server/internal/store/migrations/0001_init.sql

@@ -0,0 +1,56 @@
+-- 0001_init.sql
+CREATE TABLE IF NOT EXISTS users (
+    id BIGSERIAL PRIMARY KEY,
+    username TEXT NOT NULL UNIQUE,
+    display_name TEXT NOT NULL DEFAULT '',
+    password_hash TEXT NOT NULL,
+    avatar TEXT NOT NULL DEFAULT '',
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE IF NOT EXISTS sessions (
+    id BIGSERIAL PRIMARY KEY,
+    user_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    refresh_hash TEXT NOT NULL,
+    user_agent TEXT NOT NULL DEFAULT '',
+    ip TEXT NOT NULL DEFAULT '',
+    expires_at TIMESTAMPTZ NOT NULL,
+    revoked_at TIMESTAMPTZ,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+CREATE INDEX IF NOT EXISTS idx_sessions_user ON sessions(user_id);
+CREATE INDEX IF NOT EXISTS idx_sessions_refresh_hash ON sessions(refresh_hash);
+
+CREATE TABLE IF NOT EXISTS contacts (
+    owner_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    contact_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    PRIMARY KEY(owner_id, contact_id),
+    CHECK(owner_id <> contact_id)
+);
+
+CREATE TABLE IF NOT EXISTS conversations (
+    id BIGSERIAL PRIMARY KEY,
+    type TEXT NOT NULL CHECK(type IN ('dm','group')),
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE TABLE IF NOT EXISTS conversation_members (
+    conversation_id BIGINT NOT NULL REFERENCES conversations(id) ON DELETE CASCADE,
+    user_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    last_read_at TIMESTAMPTZ,
+    joined_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    PRIMARY KEY(conversation_id, user_id)
+);
+CREATE INDEX IF NOT EXISTS idx_members_user ON conversation_members(user_id);
+
+CREATE TABLE IF NOT EXISTS messages (
+    id BIGSERIAL PRIMARY KEY,
+    conversation_id BIGINT NOT NULL REFERENCES conversations(id) ON DELETE CASCADE,
+    sender_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    body TEXT NOT NULL DEFAULT '',
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    edited_at TIMESTAMPTZ,
+    deleted_at TIMESTAMPTZ
+);
+CREATE INDEX IF NOT EXISTS idx_messages_conversation_id ON messages(conversation_id, id DESC);