From 95f8e9a70bd1f2a4dc6f55eb703f30ec5898c315 Mon Sep 17 00:00:00 2001
From: Catherine Renelle <32781029+catrenelle@users.noreply.github.com>
Date: Thu, 26 Feb 2026 07:40:13 -0500
Subject: [PATCH] Fix column/card ordering: set COLLATE C on position columns

Postgres en_US.utf8 collation sorts case-insensitively, breaking the
lexicographic fractional indexing. Setting COLLATE "C" ensures pure
byte-order sorting. Applied via setup-collation.sql in entrypoint
after prisma db push.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 docker-entrypoint.sh        | 7 +++++++
 scripts/setup-collation.sql | 6 ++++++
 2 files changed, 13 insertions(+)
 create mode 100644 scripts/setup-collation.sql

diff --git a/docker-entrypoint.sh b/docker-entrypoint.sh
index d21e437..758386a 100644
--- a/docker-entrypoint.sh
+++ b/docker-entrypoint.sh
@@ -20,6 +20,13 @@ if [ $RETRY -ge $MAX_RETRIES ]; then
   exit 1
 fi
 
+echo "Applying position column collation fix..."
+if psql "$DATABASE_URL" -f ./scripts/setup-collation.sql; then
+  echo "Collation fix applied successfully."
+else
+  echo "WARNING: Failed to apply collation fix. Continuing anyway..."
+fi
+
 echo "Applying RLS policies..."
 if psql "$DATABASE_URL" -f ./scripts/setup-rls.sql; then
   echo "RLS policies applied successfully."
diff --git a/scripts/setup-collation.sql b/scripts/setup-collation.sql
new file mode 100644
index 0000000..32762df
--- /dev/null
+++ b/scripts/setup-collation.sql
@@ -0,0 +1,6 @@
+-- Set COLLATE "C" on position columns so fractional indexing sorts correctly.
+-- en_US.utf8 collation is case-insensitive and breaks lexicographic ordering.
+-- This must run after prisma db push since push may reset column types.
+
+ALTER TABLE columns ALTER COLUMN position SET DATA TYPE text COLLATE "C";
+ALTER TABLE cards ALTER COLUMN position SET DATA TYPE text COLLATE "C";