fix(scripts): ensure postgres env aliases during restore

scripts/restore.sh

@@ -62,6 +62,59 @@ restore_env_if_present() {
   fi
 }
 
+env_value() {
+  local key="$1"
+  local file="$2"
+
+  awk -v key="$key" '
+    $0 ~ "^[[:space:]]*" key "=" {
+      sub(/^[^=]*=/, "")
+      print
+      exit
+    }
+  ' "$file"
+}
+
+set_env_value() {
+  local key="$1"
+  local value="$2"
+  local file="$3"
+  local tmp_path
+
+  tmp_path="$(mktemp)"
+  awk -v key="$key" -v value="$value" '
+    $0 ~ "^[[:space:]]*" key "=" {
+      print key "=" value
+      found = 1
+      next
+    }
+    { print }
+    END {
+      if (!found) {
+        print key "=" value
+      }
+    }
+  ' "$file" > "$tmp_path"
+  mv "$tmp_path" "$file"
+  chmod 600 "$file" || true
+}
+
+sync_postgres_env_aliases() {
+  local db_name db_user db_password
+
+  db_name="$(env_value DB_NAME "$BACKEND_ENV")"
+  db_user="$(env_value DB_USER "$BACKEND_ENV")"
+  db_password="$(env_value DB_PASSWORD "$BACKEND_ENV")"
+
+  [[ -n "$db_name" ]] || fail "DB_NAME is missing or empty in $BACKEND_ENV"
+  [[ -n "$db_user" ]] || fail "DB_USER is missing or empty in $BACKEND_ENV"
+  [[ -n "$db_password" ]] || fail "DB_PASSWORD is missing or empty in $BACKEND_ENV"
+
+  set_env_value POSTGRES_DB "$db_name" "$BACKEND_ENV"
+  set_env_value POSTGRES_USER "$db_user" "$BACKEND_ENV"
+  set_env_value POSTGRES_PASSWORD "$db_password" "$BACKEND_ENV"
+}
+
 if [[ "${1:-}" == "-h" || "${1:-}" == "--help" ]]; then
   usage
   exit 0
@@ -99,6 +152,9 @@ fi
 require_file "$BACKEND_ENV"
 require_file "$DEPLOY_ENV"
 
+log "Ensuring PostgreSQL environment aliases exist"
+sync_postgres_env_aliases
+
 log "Checking Docker Compose configuration"
 compose config -q