Delete row sig_61a4f50808b6 from signals

id sig_61a4f50808b6
event_id evt_12c7dd0630b4
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5114497 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-14T20:09:12Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-17T20:09:12.578310+00:00
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