Delete row sig_531fc2775044 from signals

id sig_531fc2775044
event_id evt_064d3ecefaae
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-07T15:47:52.080028+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:d088dc401ac0b331
throttle_s 0
created_at 2026-04-07T15:47:52.080028+00:00
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