feat(sql): v_transceiver_ff_speed_errors — LUPO-34 Datenqualitaet-View (unmoegliche form_factor x speed, ~250 Zeilen zur Kuratierung)

sql/134-transceiver-ff-speed-errors.sql

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+-- sql/134-transceiver-ff-speed-errors.sql
+-- LUPO-34: data-quality curation view for physically-impossible form_factor x speed
+-- combinations. An SFP-class module (SFP/SFP+/SFP28/XFP/GBIC/CSFP) tops out at 25-28G,
+-- so speed_gbps >= 50 on such a form factor is a misclassification (surfaced in Lupo's
+-- per-SKU price panel as flagged rows). Evidence-based (physics), NOT name-derived.
+-- Read-only; the exact corrected speed needs the vendor datasheet (data-owner task).
+-- SFP-DD / SFP112 legitimately carry >=100G and are intentionally NOT flagged.
+create or replace view v_transceiver_ff_speed_errors as
+select t.id, v.name as vendor, t.part_number, t.speed_gbps, t.form_factor
+from transceivers t
+left join vendors v on v.id = t.vendor_id
+where upper(coalesce(t.form_factor, '')) in ('SFP', 'SFP+', 'SFP28', 'XFP', 'GBIC', 'CSFP')
+  and t.speed_gbps >= 50;
+
+comment on view v_transceiver_ff_speed_errors is
+  'LUPO-34: SFP-class parts with an impossible speed (>=50G). Data-quality curation list; exact correction needs the datasheet.';
+
+-- Usage:
+--   select count(*) from v_transceiver_ff_speed_errors;                       -- total to curate
+--   select vendor, count(*) from v_transceiver_ff_speed_errors group by 1 order by 2 desc;