diff --git a/providers/crtsh_provider.py b/providers/crtsh_provider.py
index e4bda95..c946c74 100644
--- a/providers/crtsh_provider.py
+++ b/providers/crtsh_provider.py
@@ -2,15 +2,37 @@
 
 import json
 import re
+import psycopg2
 from pathlib import Path
 from typing import List, Dict, Any, Set, Optional
 from urllib.parse import quote
 from datetime import datetime, timezone
 import requests
+from psycopg2 import pool
 
 from .base_provider import BaseProvider
 from core.provider_result import ProviderResult
 from utils.helpers import _is_valid_domain
+from core.logger import get_forensic_logger
+
+# --- Global Instance for PostgreSQL Connection Pool ---
+# This pool will be created once per worker process and is not part of the
+# CrtShProvider instance, thus avoiding pickling errors.
+db_pool = None
+try:
+    db_pool = psycopg2.pool.SimpleConnectionPool(
+        1, 5,
+        host='crt.sh',
+        port=5432,
+        user='guest',
+        dbname='certwatch',
+        sslmode='prefer',
+        connect_timeout=60
+    )
+    # Use a generic logger here as this is at the module level
+    get_forensic_logger().logger.info("crt.sh: Global PostgreSQL connection pool created successfully.")
+except Exception as e:
+    get_forensic_logger().logger.warning(f"crt.sh: Failed to create global DB connection pool: {e}. Will fall back to HTTP API.")
 
 
 class CrtShProvider(BaseProvider):
@@ -37,7 +59,7 @@ class CrtShProvider(BaseProvider):
         
         # Compile regex for date filtering for efficiency
         self.date_pattern = re.compile(r'^\d{4}-\d{2}-\d{2}[ T]\d{2}:\d{2}:\d{2}')
-    
+
     def get_name(self) -> str:
         """Return the provider name."""
         return "crtsh"
@@ -121,7 +143,7 @@ class CrtShProvider(BaseProvider):
             
             else:  # "stale" or "not_found"
                 # Query the API for the latest certificates
-                new_raw_certs = self._query_crtsh_api(domain)
+                new_raw_certs = self._query_crtsh(domain)
                 
                 if self._stop_event and self._stop_event.is_set():
                     return ProviderResult()
@@ -152,8 +174,8 @@ class CrtShProvider(BaseProvider):
                 # Save the new result and the raw data to the cache
                 self._save_result_to_cache(cache_file, result, raw_certificates_to_process, domain)
 
-        except requests.exceptions.RequestException as e:
-            self.logger.logger.error(f"API query failed for {domain}: {e}")
+        except (requests.exceptions.RequestException, psycopg2.Error) as e:
+            self.logger.logger.error(f"Upstream query failed for {domain}: {e}")
             if cache_status != "not_found":
                 result = self._load_from_cache(cache_file)
                 self.logger.logger.warning(f"Using stale cache for {domain} due to API failure.")
@@ -255,6 +277,58 @@ class CrtShProvider(BaseProvider):
                 json.dump(cache_data, f, separators=(',', ':'), default=str)
         except Exception as e:
             self.logger.logger.warning(f"Failed to save cache file for {domain}: {e}")
+            
+    def _query_crtsh(self, domain: str) -> List[Dict[str, Any]]:
+        """Query crt.sh, trying the database first and falling back to the API."""
+        global db_pool
+        if db_pool:
+            try:
+                self.logger.logger.info(f"crt.sh: Attempting DB query for {domain}")
+                return self._query_crtsh_db(domain)
+            except psycopg2.Error as e:
+                self.logger.logger.warning(f"crt.sh: DB query failed for {domain}: {e}. Falling back to HTTP API.")
+                return self._query_crtsh_api(domain)
+        else:
+            self.logger.logger.info(f"crt.sh: No DB connection pool. Using HTTP API for {domain}")
+            return self._query_crtsh_api(domain)
+
+    def _query_crtsh_db(self, domain: str) -> List[Dict[str, Any]]:
+        """Query crt.sh database for raw certificate data."""
+        global db_pool
+        conn = db_pool.getconn()
+        try:
+            with conn.cursor() as cursor:
+                query = """
+                SELECT
+                    c.id,
+                    x509_serialnumber(c.certificate) as serial_number,
+                    x509_notbefore(c.certificate) as not_before,
+                    x509_notafter(c.certificate) as not_after,
+                    c.issuer_ca_id,
+                    ca.name as issuer_name,
+                    x509_commonname(c.certificate) as common_name,
+                    identities(c.certificate)::text as name_value
+                FROM certificate c
+                LEFT JOIN ca ON c.issuer_ca_id = ca.id
+                WHERE identities(c.certificate) @@ plainto_tsquery(%s)
+                ORDER BY c.id DESC
+                LIMIT 5000;
+                """
+                cursor.execute(query, (domain,))
+                
+                results = []
+                columns = [desc[0] for desc in cursor.description]
+                for row in cursor.fetchall():
+                    row_dict = dict(zip(columns, row))
+                    if row_dict.get('not_before'):
+                        row_dict['not_before'] = row_dict['not_before'].isoformat()
+                    if row_dict.get('not_after'):
+                        row_dict['not_after'] = row_dict['not_after'].isoformat()
+                    results.append(row_dict)
+                self.logger.logger.info(f"crt.sh: DB query for {domain} returned {len(results)} records.")
+                return results
+        finally:
+            db_pool.putconn(conn)
 
     def _query_crtsh_api(self, domain: str) -> List[Dict[str, Any]]:
         """Query crt.sh API for raw certificate data."""
@@ -468,6 +542,8 @@ class CrtShProvider(BaseProvider):
             raise ValueError("Empty date string")
 
         try:
+            if isinstance(date_string, datetime):
+                return date_string.replace(tzinfo=timezone.utc)
             if date_string.endswith('Z'):
                 return datetime.fromisoformat(date_string[:-1]).replace(tzinfo=timezone.utc)
             elif '+' in date_string or date_string.endswith('UTC'):
diff --git a/requirements.txt b/requirements.txt
index d46c0bc..4ec5adb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,4 +7,5 @@ urllib3
 dnspython
 gunicorn
 redis
-python-dotenv
\ No newline at end of file
+python-dotenv
+psycopg2-binary
\ No newline at end of file