Delete row sig_16da45eae5cd from signals

id sig_16da45eae5cd
event_id evt_606c438528bf
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T15:38:06.191000+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:3d76d2caa2b6e3ea
throttle_s 0
created_at 2026-04-11T15:38:06.191000+00:00
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