fix(ci): skip applied migrations in preflight validation

scripts/validate_migrations.sh

@@ -47,10 +47,24 @@ if ! command -v psql >/dev/null 2>&1; then
   exit 1
 fi
 
+mapfile -t executed_versions < <(
+  psql "$DB_CONNECTION_STRING" -Atc "SELECT version FROM schema_migrations ORDER BY version;" 2>/dev/null || true
+)
+
+declare -A executed_map=()
+for version in "${executed_versions[@]}"; do
+  if [ -n "$version" ]; then
+    executed_map["$version"]=1
+  fi
+done
+
 for file in "${files[@]}"; do
   name="$(basename "$file")"
   version="${name#V}"
   version="${version%%__*}"
+  if [ -n "${executed_map[$version]:-}" ]; then
+    continue
+  fi
   echo "Dry-run migration V$version: $name"
   psql "$DB_CONNECTION_STRING" -v ON_ERROR_STOP=1 <<PSQL
 BEGIN;