Delete row sig_11411534ff51 from signals

id sig_11411534ff51
event_id evt_c0e70d76c21b
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":557,"confidence":0.8463178 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T21:00:12Z ...
dedupe_key ta:technical_indicator_signal:emaCrossUp:ema_signa ...
throttle_s 0
created_at 2026-04-10T21:00:12.548256+00:00
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