Delete row sig_507a9e65e8c1 from signals

id sig_507a9e65e8c1
event_id evt_1b0d4b2cf05e
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.7695800 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-03T20:34:08Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-06T20:34:08.090195+00:00
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