Fix: remove unused imports and f-string formatting (#12935)

### What problem does this PR solve?

- Remove unused imports (Mock, patch, MagicMock, json, os,
RAGFLOW_COLUMNS, VECTOR_FIELD_PATTERN) from multiple files
- Replace f-string formatting with regular strings for console output
messages in cli.py
- Clean up unnecessary imports that were no longer being used in the
codebase

### Type of change

- [x] Refactoring

tools/es-to-oceanbase-migration/src/es_ob_migration/cli.py

@@ -15,7 +15,6 @@ from .es_client import ESClient
 from .ob_client import OBClient
 from .migrator import ESToOceanBaseMigrator
 from .verify import MigrationVerifier
-from .schema import RAGFLOW_COLUMNS
 
 console = Console()
 
@@ -115,7 +114,7 @@ def migrate(
             indices_to_migrate = [(index, table if table else index)]
         else:
             # Auto-discover all ragflow_* indices
-            console.print(f"\n[cyan]Discovering RAGFlow indices...[/]")
+            console.print("\n[cyan]Discovering RAGFlow indices...[/]")
             ragflow_indices = es_client.list_ragflow_indices()
             
             if not ragflow_indices:
@@ -166,7 +165,7 @@ def migrate(
         # Summary for multiple indices
         if len(indices_to_migrate) > 1:
             console.print(f"\n[bold]{'='*60}[/]")
-            console.print(f"[bold]Migration Summary[/]")
+            console.print("[bold]Migration Summary[/]")
             console.print(f"[bold]{'='*60}[/]")
             console.print(f"  Total indices: {len(indices_to_migrate)}")
             console.print(f"  [green]Successful: {total_success}[/]")
@@ -232,13 +231,13 @@ def schema(ctx, es_host, es_port, es_user, es_password, index, output):
         
         # Vector fields
         if analysis['vector_fields']:
-            console.print(f"\n[cyan]Vector fields detected:[/]")
+            console.print("\n[cyan]Vector fields detected:[/]")
             for vf in analysis['vector_fields']:
                 console.print(f"  - {vf['name']} (dimension: {vf['dimension']})")
         
         # Unknown fields
         if analysis['unknown_fields']:
-            console.print(f"\n[yellow]Unknown fields (will be stored in 'extra'):[/]")
+            console.print("\n[yellow]Unknown fields (will be stored in 'extra'):[/]")
             for uf in analysis['unknown_fields']:
                 console.print(f"  - {uf}")
 

tools/es-to-oceanbase-migration/src/es_ob_migration/migrator.py

@@ -18,7 +18,7 @@ from rich.progress import (
 
 from .es_client import ESClient
 from .ob_client import OBClient
-from .schema import RAGFlowSchemaConverter, RAGFlowDataConverter, VECTOR_FIELD_PATTERN
+from .schema import RAGFlowSchemaConverter, RAGFlowDataConverter
 from .progress import ProgressManager, MigrationProgress
 from .verify import MigrationVerifier
 

tools/es-to-oceanbase-migration/src/es_ob_migration/ob_client.py

@@ -4,15 +4,14 @@ OceanBase Client for RAGFlow data migration.
 This client is specifically designed for RAGFlow's data structure.
 """
 
-import json
 import logging
 from typing import Any
 
 from pyobvector import ObVecClient, FtsIndexParam, FtsParser, VECTOR, ARRAY
-from sqlalchemy import Column, String, Integer, Float, JSON, Text, text, Double
+from sqlalchemy import Column, String, Integer, Float, JSON, Double
 from sqlalchemy.dialects.mysql import LONGTEXT, TEXT as MYSQL_TEXT
 
-from .schema import RAGFLOW_COLUMNS, ARRAY_COLUMNS, FTS_COLUMNS_TKS
+from .schema import RAGFLOW_COLUMNS, FTS_COLUMNS_TKS
 
 logger = logging.getLogger(__name__)
 

tools/es-to-oceanbase-migration/src/es_ob_migration/progress.py

@@ -4,7 +4,6 @@ Progress tracking and resume capability for migration.
 
 import json
 import logging
-import os
 from dataclasses import dataclass, field, asdict
 from datetime import datetime
 from pathlib import Path

tools/es-to-oceanbase-migration/src/es_ob_migration/verify.py

@@ -9,7 +9,7 @@ from typing import Any
 
 from .es_client import ESClient
 from .ob_client import OBClient
-from .schema import RAGFLOW_COLUMNS, ARRAY_COLUMNS, JSON_COLUMNS
+from .schema import ARRAY_COLUMNS, JSON_COLUMNS
 
 logger = logging.getLogger(__name__)