feat: establish Go service and database foundation

migrations/000001_mvp.sql

@@ -0,0 +1,93 @@
+CREATE TABLE IF NOT EXISTS schema_migrations (
+    version bigint PRIMARY KEY,
+    applied_at timestamptz NOT NULL DEFAULT now()
+);
+-- statement-break
+CREATE TABLE IF NOT EXISTS import_runs (
+    id bigserial PRIMARY KEY,
+    source_sha256 text NOT NULL UNIQUE,
+    source_path text NOT NULL,
+    status text NOT NULL CHECK (status IN ('RUNNING','COMPLETED','FAILED')),
+    source_rows bigint NOT NULL DEFAULT 0,
+    session_rows bigint NOT NULL DEFAULT 0,
+    attempt_rows bigint NOT NULL DEFAULT 0,
+    started_at timestamptz NOT NULL DEFAULT now(),
+    completed_at timestamptz
+);
+-- statement-break
+CREATE TABLE IF NOT EXISTS merchants (
+    id bigserial PRIMARY KEY,
+    source_key text NOT NULL UNIQUE,
+    category_id bigint NOT NULL,
+    category_title text NOT NULL,
+    display_name text NOT NULL,
+    profile_is_synthetic boolean NOT NULL DEFAULT true
+);
+-- statement-break
+CREATE TABLE IF NOT EXISTS terminals (
+    id bigserial PRIMARY KEY,
+    merchant_id bigint NOT NULL REFERENCES merchants(id),
+    source_key text NOT NULL,
+    verify_type text NOT NULL,
+    UNIQUE (merchant_id, source_key)
+);
+-- statement-break
+CREATE TABLE IF NOT EXISTS payment_sessions (
+    id bigserial PRIMARY KEY,
+    import_run_id bigint NOT NULL REFERENCES import_runs(id),
+    merchant_id bigint NOT NULL REFERENCES merchants(id),
+    terminal_id bigint NOT NULL REFERENCES terminals(id),
+    source_key text NOT NULL,
+    status text NOT NULL,
+    amount_rial bigint NOT NULL CHECK (amount_rial >= 0),
+    fee_amount_rial bigint NOT NULL CHECK (fee_amount_rial >= 0),
+    payer_card_key text,
+    created_at timestamptz NOT NULL,
+    expires_at timestamptz,
+    verified_at timestamptz,
+    settled_at timestamptz,
+    UNIQUE (merchant_id, source_key)
+);
+-- statement-break
+CREATE TABLE IF NOT EXISTS payment_attempts (
+    id bigserial PRIMARY KEY,
+    session_id bigint NOT NULL REFERENCES payment_sessions(id) ON DELETE CASCADE,
+    sequence integer NOT NULL CHECK (sequence > 0),
+    status text NOT NULL,
+    created_at timestamptz,
+    init_time_ms integer,
+    verify_time_ms integer,
+    UNIQUE (session_id, sequence)
+);
+-- statement-break
+CREATE INDEX IF NOT EXISTS payment_sessions_merchant_created_idx ON payment_sessions (merchant_id, created_at DESC, id DESC);
+-- statement-break
+CREATE INDEX IF NOT EXISTS payment_sessions_status_idx ON payment_sessions (merchant_id, status, created_at DESC);
+-- statement-break
+CREATE INDEX IF NOT EXISTS payment_attempts_session_idx ON payment_attempts (session_id, sequence);
+-- statement-break
+CREATE TABLE IF NOT EXISTS merchant_users (
+    id bigserial PRIMARY KEY,
+    merchant_id bigint NOT NULL REFERENCES merchants(id),
+    username text NOT NULL UNIQUE,
+    password_hash text NOT NULL,
+    is_active boolean NOT NULL DEFAULT true,
+    created_at timestamptz NOT NULL DEFAULT now()
+);
+-- statement-break
+CREATE TABLE IF NOT EXISTS auth_sessions (
+    id bigserial PRIMARY KEY,
+    user_id bigint NOT NULL REFERENCES merchant_users(id),
+    merchant_id bigint NOT NULL REFERENCES merchants(id),
+    token_hash bytea NOT NULL UNIQUE,
+    csrf_token text NOT NULL,
+    created_at timestamptz NOT NULL,
+    idle_expires_at timestamptz NOT NULL,
+    absolute_expires_at timestamptz NOT NULL,
+    revoked_at timestamptz,
+    last_seen_at timestamptz NOT NULL
+);
+-- statement-break
+CREATE INDEX IF NOT EXISTS auth_sessions_token_idx ON auth_sessions (token_hash) WHERE revoked_at IS NULL;
+-- statement-break
+INSERT INTO schema_migrations(version) VALUES (1) ON CONFLICT DO NOTHING;