Add decision packets and alert records

migrations/030_create_decision_packets.sql

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+create table if not exists decision_packets (
+    id bigserial primary key,
+    instrument_id bigint not null references instruments(id),
+    trading_plan_id bigint references trading_plans(id),
+    candidate_id bigint references trade_plan_candidates(id),
+    signal_id bigint references trade_signals(id),
+    execution_ticket_id bigint references execution_tickets(id),
+    packet_ts timestamptz not null,
+    status text not null,
+    action_recommendation text not null,
+    quality_score numeric,
+    ai_explanation text,
+    payload jsonb not null default '{}'::jsonb,
+    created_at timestamptz not null default now()
+);
+
+create index if not exists idx_decision_packets_instrument_ts_desc
+on decision_packets (instrument_id, packet_ts desc, id desc);
+
+create table if not exists decision_alerts (
+    id bigserial primary key,
+    instrument_id bigint not null references instruments(id),
+    decision_packet_id bigint references decision_packets(id),
+    alert_key text not null unique,
+    alert_type text not null,
+    status text not null,
+    channel text not null default 'workbench',
+    message text not null,
+    payload jsonb not null default '{}'::jsonb,
+    created_ts timestamptz not null,
+    delivered_ts timestamptz
+);
+
+create index if not exists idx_decision_alerts_instrument_ts_desc
+on decision_alerts (instrument_id, created_ts desc, id desc);