Delete row sig_038902f42623 from signals

id sig_038902f42623
event_id evt_aad4b25f0dcc
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-17T12:37:29.134103+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:ff88fec73a5e0f80
throttle_s 0
created_at 2026-04-17T12:37:29.134103+00:00
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