create table if not exists operator_notes (
    id bigserial primary key,
    instrument_id bigint not null references instruments(id),
    note_scope text not null,
    session_code text,
    execution_id bigint references trade_executions(id),
    signal_id bigint references trade_signals(id),
    candidate_id bigint references trade_plan_candidates(id),
    decision_packet_id bigint references decision_packets(id),
    author text not null,
    body text not null,
    tags jsonb not null default '[]'::jsonb,
    created_ts timestamptz not null,
    updated_at timestamptz not null default now()
);

create index if not exists idx_operator_notes_instrument_created_desc
on operator_notes (instrument_id, created_ts desc, id desc);