Delete row sig_ffdf926312bd from signals

id sig_ffdf926312bd
event_id evt_51777a069383
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T00:28:32.486563+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b6eda6b3172dcdf1
throttle_s 0
created_at 2026-04-20T00:28:32.486563+00:00
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