fix .env.example var and docs

EXAMPLE_WORKFLOW.md

@@ -74,8 +74,9 @@ nano .env
 # POSTGRES_PASSWORD=password123
 # POSTGRES_DATABASE=production_migrated
 #
-# BATCH_SIZE=50000        # Large batches for speed
 # LOG_LEVEL=INFO
+# CONSOLIDATION_GROUP_LIMIT=80000    # Large batches for speed
+# PROGRESS_LOG_INTERVAL=20000
 ```
 
 ### 4. Verifica Configurazione (5 min)
@@ -335,8 +336,11 @@ python main.py setup --create-schema
 
 ### Migrazione molto lenta
 ```bash
-# Aumentare batch size temporaneamente
-# Editare .env: BATCH_SIZE=100000
+# Aumentare consolidation group limit temporaneamente
+# Editare .env: CONSOLIDATION_GROUP_LIMIT=100000
+
+# Ridurre logging
+# Editare .env: PROGRESS_LOG_INTERVAL=50000
 
 # Oppure verificare:
 # - Latency rete MySQL↔PostgreSQL