fix: Update progress tracking to use MySQL row count instead of PostgreSQL count

The progress bar was appearing frozen because:
- Total was set to MySQL rows to process (111M)
- Progress was updated by PostgreSQL rows inserted (11M after consolidation)
- This created a 10:1 mismatch, making progress appear to crawl

Solution:
- Track progress based on MySQL rows processed (matches total)
- Use batch_size (MySQL rows) instead of inserted count (PostgreSQL rows)
- Change batch_max_id calculation to use original batch instead of transformed

This ensures the progress bar advances at a visible rate while still
maintaining accurate row count tracking from the database.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/migrator/full_migration.py

@@ -104,6 +104,9 @@ class FullMigrator:
                             if not batch:
                                 break
 
+                            # Track MySQL rows processed for progress (before consolidation)
+                            batch_size = len(batch)
+
                             # Transform batch with consolidation enabled
                             transformed = DataTransformer.transform_batch(
                                 mysql_table,
@@ -120,14 +123,14 @@ class FullMigrator:
                             )
 
                             if inserted > 0:
-                                # For consolidated batches, count transformed rows, not source rows
-                                migrated += inserted
-                                progress.update(inserted)
+                                # Update progress based on MySQL rows processed
+                                # (not PostgreSQL rows inserted, since consolidation reduces count)
+                                progress.update(batch_size)
 
                                 # Update state after each batch for resume capability
                                 # Use MAX id of the batch (represents last MySQL id processed)
                                 batch_max_id = max(
-                                    int(row.get("id", 0)) for row in transformed
+                                    int(row.get("id", 0)) for row in batch
                                 )
                                 # Get actual row count from PostgreSQL for accuracy
                                 actual_count = pg_conn.get_row_count(pg_table)
@@ -135,12 +138,13 @@ class FullMigrator:
                                     pg_conn, actual_count, batch_max_id, migration_start_time
                                 )
 
+                    # Get final actual count from PostgreSQL
+                    final_count = pg_conn.get_row_count(pg_table)
                     logger.info(
-                        f"✓ Migration complete: {migrated} rows migrated "
-                        f"to {pg_table}"
+                        f"✓ Migration complete: {final_count} total rows in {pg_table}"
                     )
 
-                    return migrated
+                    return final_count
 
         except Exception as e:
             logger.error(f"Migration failed: {e}")