Delete row sig_af153ee3cf8f from signals

id sig_af153ee3cf8f
event_id evt_78d73f35f4cc
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-21T04:44:44.826988+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:1a7320c06a2b1ba4
throttle_s 0
created_at 2026-04-21T04:44:44.826988+00:00
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