diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 372e59a..3c3e436 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -61,8 +61,9 @@ jobs:
           TAG_CLAIMED=false
           for ATTEMPT in 1 2 3 4 5; do
             git fetch --tags --force
-            EXISTING=$(git tag -l "*-${YEAR_MONTH}.*" | wc -l | tr -d ' ')
-            N=$((EXISTING + 1))
+            # Use max(N) not count — safe even if tags are deleted
+            MAX_N=$(git tag -l "*-${YEAR_MONTH}.*" | sed 's/.*\.//' | sort -n | tail -1)
+            N=$(( ${MAX_N:-0} + 1 ))
             VERSION="${YEAR_MONTH}.${N}"
             TAG="${CHANNEL}-${VERSION}"
 
diff --git a/CLAUDE.md b/CLAUDE.md
index b6497bb..767e0c4 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -154,7 +154,7 @@ Auth providers in `app/auth/` (FastAPI-based):
 ## Key Implementation Details
 
 ### DuckDB Schema (src/db.py)
-- Schema v2 with auto-migration from v1
+- Schema v3 with auto-migration from v1→v2→v3
 - `table_registry`: id, name, source_type, bucket, source_table, query_mode, sync_schedule, etc.
 - `sync_state`, `sync_history`: track extraction progress
 - `users`, `dataset_permissions`, `audit_log`: auth + RBAC
diff --git a/scripts/smoke-test.sh b/scripts/smoke-test.sh
index c2962b8..e422596 100755
--- a/scripts/smoke-test.sh
+++ b/scripts/smoke-test.sh
@@ -13,10 +13,10 @@ check() {
     local name="$1" ok="$2"
     if [ "$ok" = "true" ]; then
         echo "  PASS $name"
-        ((PASS++))
+        PASS=$((PASS + 1))
     else
         echo "  FAIL $name"
-        ((FAIL++))
+        FAIL=$((FAIL + 1))
     fi
 }