Delete row sig_2154c749aafe from signals

id sig_2154c749aafe
event_id evt_64b03d53d148
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T00:29:20.364194+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d5c44ce77d1985b2
throttle_s 0
created_at 2026-04-12T00:29:20.364194+00:00
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