Delete row sig_ffa2c7c6d556 from signals

id sig_ffa2c7c6d556
event_id evt_302b7c60e549
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":58,"confidence":0.61164515 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-17T20:17:10Z ...
dedupe_key ta:technical_indicator_signal:priceAboveEma12:ema_ ...
throttle_s 0
created_at 2026-04-20T20:17:10.987913+00:00
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