Delete row sig_e2cbc267012e from signals

id sig_e2cbc267012e
event_id evt_cb3f7a58d464
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":379,"confidence":0.6048295 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-10T20:03:56Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-13T20:03:56.732085+00:00
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