Delete row sig_ff715f761df7 from signals

id sig_ff715f761df7
event_id evt_b46fe059327e
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5896232 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-03-31T20:38:14Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-03T20:38:14.037571+00:00
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