Delete row sig_87387016a31e from signals

id sig_87387016a31e
event_id evt_bbd7a111ac84
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T23:58:45.234923+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:38ad6ccda6f7472a
throttle_s 0
created_at 2026-04-09T23:58:45.234923+00:00
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