Delete row sig_e191100db414 from signals

id sig_e191100db414
event_id evt_c381c505d44d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T23:36:03.526107+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:ae90e243418087bd
throttle_s 0
created_at 2026-04-19T23:36:03.526107+00:00
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