refactor backend for minor improvements

Backend/agents/vision/agent.py

@@ -168,7 +168,7 @@ class VisionAgent(BaseAgent):
         gemini_category = None
         gemini_confidence = 0.0
         gemini_reasoning = None
-        if self.gemini_model and (not detections or max(d.confidence for d in detections) < 0.5):
+        if self.gemini_model and detections and max(d.confidence for d in detections) < 0.5:
             gemini_category, gemini_confidence, gemini_reasoning = await self.gemini_classify_image(
                 image_data=image_data,
                 description=description

Backend/agents/vision/model.pt

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:55bb189306a9882c84fb471b9cc81e2ba48363d1a4c49ccf914e9a08cde01c24
-size 22512426
+oid sha256:b3ec8d59f0db26383a08fb3e132261495ea069a7a32546b1ff142ba375f28edc
+size 22538026

Backend/core/config.py

@@ -38,6 +38,13 @@ class Settings(BaseSettings):
     api_host: str = "0.0.0.0"
     api_port: int = 8000
     api_workers: int = 4
+
+    db_pool_size: int = 5
+    db_max_overflow: int = 5
+    db_pool_timeout: int = 30
+    db_pool_recycle: int = 1800
+    db_statement_cache_size: int = 0
+    db_prepared_statement_cache_size: int = 0
     
     max_upload_size_mb: int = 10
     allowed_extensions: set[str] = {"jpg", "jpeg", "png", "webp"}

Backend/database/connection.py

@@ -1,7 +1,6 @@
 from contextlib import asynccontextmanager
 from typing import AsyncGenerator
 from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
-from sqlalchemy.pool import NullPool
 
 from Backend.core.config import settings
 
@@ -9,11 +8,15 @@ database_url = settings.database_url.replace("postgresql://", "postgresql+asyncp
 
 engine = create_async_engine(
     database_url,
-    poolclass=NullPool,
     echo=False,
+    pool_size=settings.db_pool_size,
+    max_overflow=settings.db_max_overflow,
+    pool_timeout=settings.db_pool_timeout,
+    pool_recycle=settings.db_pool_recycle,
+    pool_pre_ping=True,
     connect_args={
-        "statement_cache_size": 0,
-        "prepared_statement_cache_size": 0,
+        "statement_cache_size": settings.db_statement_cache_size,
+        "prepared_statement_cache_size": settings.db_prepared_statement_cache_size,
     },
 )
 

Backend/utils/fuzzy_match.py

@@ -28,7 +28,7 @@ CATEGORY_KEYWORDS: dict[str, list[str]] = {
     ],
     "Vandalism Issues": [
         "vandal", "graffiti", "spray", "paint", "defaced",
-        "smashed", "destroyed", "damaged property", "torn"
+        "smashed", "destroyed", "torn"
     ],
     "Dead Animal Pollution": [
         "dead", "animal", "carcass", "body", "corpse", "rotting", "smell",
@@ -36,7 +36,7 @@ CATEGORY_KEYWORDS: dict[str, list[str]] = {
     ],
     "Damaged Concrete Structures": [
         "concrete", "structure", "wall", "pillar", "bridge", "flyover",
-        "footpath", "sidewalk", "curb", "crack", "broken"
+        "footpath", "sidewalk", "curb", "crack", "broken", "Damaged Concrete"
     ],
     "Damaged Electric Wires and Poles": [
         "electric", "wire", "pole", "cable", "power", "electricity",