Delete row sig_28448741bee2 from signals

id sig_28448741bee2
event_id evt_29d9e007129e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T00:54:54.010026+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:8a072dbaeb06e283
throttle_s 0
created_at 2026-04-18T00:54:54.010026+00:00
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