Phase 6 execution tickets

migrations/024_create_execution_tickets.sql

@@ -0,0 +1,23 @@
+create table if not exists execution_tickets (
+    id bigserial primary key,
+    signal_id bigint not null references trade_signals(id),
+    execution_mode text not null,
+    status text not null,
+    created_ts timestamptz not null,
+    expires_ts timestamptz,
+    confirmed_by text,
+    confirmed_at timestamptz,
+    execution_id bigint references trade_executions(id),
+    ticket_snapshot jsonb not null default '{}'::jsonb,
+    created_at timestamptz not null default now(),
+    updated_at timestamptz not null default now()
+);
+
+create index if not exists idx_execution_tickets_signal_created_desc
+on execution_tickets (signal_id, created_ts desc);
+
+create index if not exists idx_execution_tickets_status_created_desc
+on execution_tickets (status, created_ts desc);
+
+create index if not exists idx_execution_tickets_execution_id
+on execution_tickets (execution_id);