refactor(api): improve memory service dependency injection and code organization

- Update ShortService and LongService constructors to accept db Session parameter for proper dependency injection instead of using module-level db instance
- Reorganize imports in memory_short_term_controller.py following PEP 8 conventions (stdlib, third-party, local imports)
- Add comprehensive docstrings with type hints to ShortService and LongService methods for better code documentation
- Fix import organization in memory_short_service.py to group related imports and improve readability
- Reorganize imports in user_memory_service.py to follow consistent import ordering patterns
- Update ShortService instantiation in analytics_memory_types to pass db parameter
- Remove module-level db instance initialization in favor of caller-managed database session lifecycle
- Add type annotations to method signatures (end_user_id: str, db: Session, return types)
- Improve code formatting and spacing consistency across memory service files

api/app/controllers/memory_short_term_controller.py

@@ -1,16 +1,18 @@
-from fastapi import APIRouter, Depends, HTTPException, status,Header
+from typing import Optional
+
+from dotenv import load_dotenv
+from fastapi import APIRouter, Depends, Header, HTTPException, status
+from sqlalchemy.orm import Session
+
 from app.core.language_utils import get_language_from_header
 from app.core.logging_config import get_api_logger
 from app.core.response_utils import success
 from app.db import get_db
 from app.dependencies import get_current_user
 from app.models.user_model import User
-
+from app.services.memory_short_service import LongService, ShortService
 from app.services.memory_storage_service import search_entity
-from app.services.memory_short_service import ShortService,LongService
+
-from dotenv import load_dotenv
-from sqlalchemy.orm import Session
-from typing import Optional
 load_dotenv()
 api_logger = get_api_logger()
 
@@ -29,11 +31,11 @@ async def short_term_configs(
     language = get_language_from_header(language_type)
     
     # 获取短期记忆数据
-    short_term=ShortService(end_user_id)
+    short_term=ShortService(end_user_id, db)
     short_result=short_term.get_short_databasets()
     short_count=short_term.get_short_count()
 
-    long_term=LongService(end_user_id)
+    long_term=LongService(end_user_id, db)
     long_result=long_term.get_long_databasets()
 
     entity_result = await search_entity(end_user_id)

api/app/services/memory_short_service.py

@@ -1,22 +1,37 @@
+from typing import Dict, List
+
+from sqlalchemy.orm import Session
 
 from app.core.logging_config import get_api_logger
-from app.db import get_db
+from app.repositories.memory_short_repository import (
-from app.repositories.memory_short_repository import LongTermMemoryRepository
+    LongTermMemoryRepository,
-from app.repositories.memory_short_repository import ShortTermMemoryRepository
+    ShortTermMemoryRepository,
-
+)
 
 api_logger = get_api_logger()
-db=next(get_db())
+
+
 class ShortService:
-    def __init__(self, end_user_id):
+    def __init__(self, end_user_id: str, db: Session) -> None:
+        """Service for short-term memory queries.
+
+        Args:
+            end_user_id: The end user identifier to query memories for.
+            db: SQLAlchemy database session (caller-managed lifecycle).
+        """
         self.short_repo = ShortTermMemoryRepository(db)
         self.end_user_id = end_user_id
 
-    def get_short_databasets(self):
+    def get_short_databasets(self) -> List[Dict]:
+        """Retrieve the latest short-term memory entries for the user.
+
+        Returns:
+            List[Dict]: List of memory dicts with retrieval, message, and answer keys.
+        """
         short_memories = self.short_repo.get_latest_by_user_id(self.end_user_id, 3)
         short_result = []
         for memory in short_memories:
-            deep_expanded = {}  # Create a new dictionary for each memory
+            deep_expanded = {}
             messages = memory.messages
             aimessages = memory.aimessages
             retrieved_content = memory.retrieved_content or []
@@ -30,20 +45,38 @@ class ShortService:
                         retrieval_source.append({"query": key, "retrieval": values, "source": "上下文记忆"})
 
             deep_expanded['retrieval'] = retrieval_source
-            deep_expanded['message'] = messages  # 修正拼写错误
+            deep_expanded['message'] = messages
             deep_expanded['answer'] = aimessages
             short_result.append(deep_expanded)
         return short_result
-    def get_short_count(self):
+
+    def get_short_count(self) -> int:
+        """Count total short-term memory entries for the user.
+
+        Returns:
+            int: Number of short-term memory records.
+        """
         short_count = self.short_repo.count_by_user_id(self.end_user_id)
         return short_count
 
+
 class LongService:
-    def __init__(self, end_user_id):
+    def __init__(self, end_user_id: str, db: Session) -> None:
+        """Service for long-term memory queries.
+
+        Args:
+            end_user_id: The end user identifier to query memories for.
+            db: SQLAlchemy database session (caller-managed lifecycle).
+        """
         self.long_repo = LongTermMemoryRepository(db)
         self.end_user_id = end_user_id
-    def get_long_databasets(self):
+
-        # 获取长期记忆数据
+    def get_long_databasets(self) -> List[Dict]:
+        """Retrieve long-term memory retrieval data for the user.
+
+        Returns:
+            List[Dict]: List of dicts with query and retrieval keys.
+        """
         long_memories = self.long_repo.get_by_user_id(self.end_user_id, 1)
 
         long_result = []

api/app/services/user_memory_service.py

@@ -10,6 +10,9 @@ from collections import Counter
 from datetime import datetime
 from typing import Any, Dict, List, Optional, Tuple
 
+from pydantic import BaseModel, Field
+from sqlalchemy.orm import Session
+
 from app.core.logging_config import get_logger
 from app.core.memory.utils.llm.llm_utils import MemoryClientFactory
 from app.db import get_db_context
@@ -23,8 +26,6 @@ from app.services.memory_base_service import MemoryBaseService, MemoryTransServi
 from app.services.memory_config_service import MemoryConfigService
 from app.services.memory_perceptual_service import MemoryPerceptualService
 from app.services.memory_short_service import ShortService
-from pydantic import BaseModel, Field
-from sqlalchemy.orm import Session
 
 logger = get_logger(__name__)
 
@@ -1035,10 +1036,11 @@ async def analytics_memory_insight_report(end_user_id: Optional[str] = None, lan
             "growth_trajectory": str         # 成长轨迹
         }
     """
-    from app.core.memory.utils.prompt.prompt_utils import render_memory_insight_prompt
-    from app.core.language_utils import validate_language
     import re
 
+    from app.core.language_utils import validate_language
+    from app.core.memory.utils.prompt.prompt_utils import render_memory_insight_prompt
+    
     # 验证语言参数
     language = validate_language(language)
     
@@ -1161,12 +1163,13 @@ async def analytics_user_summary(end_user_id: Optional[str] = None, language: st
             "one_sentence": str
         }
     """
-    from app.core.memory.utils.prompt.prompt_utils import render_user_summary_prompt
-    from app.core.language_utils import validate_language
-    from app.repositories.end_user_repository import EndUserRepository
-    from app.db import get_db
     import re
 
+    from app.core.language_utils import validate_language
+    from app.core.memory.utils.prompt.prompt_utils import render_user_summary_prompt
+    from app.db import get_db
+    from app.repositories.end_user_repository import EndUserRepository
+    
     # 验证语言参数
     language = validate_language(language)
     
@@ -1457,7 +1460,7 @@ async def analytics_memory_types(
     short_term_count = 0
     if end_user_id:
         try:
-            short_term_service = ShortService(end_user_id)
+            short_term_service = ShortService(end_user_id, db)
             short_term_data = short_term_service.get_short_databasets()
             # 统计 short_term 数组的长度
             if short_term_data:
@@ -1471,8 +1474,10 @@ async def analytics_memory_types(
     forgetting_threshold = 0.3  # 默认值
     if end_user_id:
         try:
+            from app.core.memory.storage_services.forgetting_engine.config_utils import (
+                load_actr_config_from_db,
+            )
             from app.services.memory_agent_service import get_end_user_connected_config
-            from app.core.memory.storage_services.forgetting_engine.config_utils import load_actr_config_from_db
             
             # 获取用户关联的 config_id
             connected_config = get_end_user_connected_config(end_user_id, db)