Delete row sig_fb1f23c3c30f from signals

id sig_fb1f23c3c30f
event_id evt_b1e604589354
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5064627 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-18T20:33:02Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-21T20:33:02.567841+00:00
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