Delete row sig_6da657bafe20 from signals

id sig_6da657bafe20
event_id evt_6e6c069b7581
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-21T17:33:02.490256+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:409fa0d3c61abed0
throttle_s 0
created_at 2026-04-21T17:33:02.490256+00:00
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