Backfill csv_data on campaign sources

Fresh installs already had csv_data on campaign sources from the
initial migration; add a follow-up migration to backfill existing
rows from the live source snapshot.

Signed-off-by: Bryan Frimin <bryan@probo.com>

pkg/coredata/migrations/20260612T020000Z.sql

@@ -0,0 +1,26 @@
+-- Copyright (c) 2026 Probo Inc <hello@probo.com>.
+--
+-- Permission to use, copy, modify, and/or distribute this software for any
+-- purpose with or without fee is hereby granted, provided that the above
+-- copyright notice and this permission notice appear in all copies.
+--
+-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+-- REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+-- AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+-- INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+-- LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+-- OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+-- PERFORMANCE OF THIS SOFTWARE.
+
+-- Snapshot CSV payloads on campaign sources (20260611T010000Z shipped without
+-- this column; fresh installs get it from the CREATE TABLE in that migration).
+
+ALTER TABLE access_review_campaign_sources
+    ADD COLUMN IF NOT EXISTS csv_data TEXT;
+
+UPDATE access_review_campaign_sources cs
+SET csv_data = s.csv_data
+FROM access_review_sources s
+WHERE cs.access_review_source_id = s.id
+  AND cs.csv_data IS NULL
+  AND s.csv_data IS NOT NULL;