diff --git a/aider_gitea/seen_issues_db.py b/aider_gitea/seen_issues_db.py
index 19de052..e6ff176 100644
--- a/aider_gitea/seen_issues_db.py
+++ b/aider_gitea/seen_issues_db.py
@@ -1,3 +1,11 @@
+"""
+Database module for tracking previously processed issues.
+
+This module provides functionality to track which issues have already been processed
+by the system to avoid duplicate processing. It uses a simple SQLite database to
+store hashes of seen issues for efficient lookup.
+"""
+
 import sqlite3
 from hashlib import sha256
 
@@ -5,11 +13,33 @@ DEFAULT_DB_PATH = 'output/seen_issues.db'
 
 
 class SeenIssuesDB:
+    """
+    Database handler for tracking processed issues.
+    
+    This class manages a SQLite database that stores hashes of issues that have
+    already been processed. It provides methods to mark issues as seen and check
+    if an issue has been seen before, helping to prevent duplicate processing.
+    
+    Attributes:
+        conn: SQLite database connection
+    """
+    
     def __init__(self, db_path=DEFAULT_DB_PATH):
+        """
+        Initialize the database connection.
+        
+        Args:
+            db_path: Path to the SQLite database file. Defaults to 'output/seen_issues.db'.
+        """
         self.conn = sqlite3.connect(db_path)
         self._create_table()
 
     def _create_table(self):
+        """
+        Create the seen_issues table if it doesn't exist.
+        
+        Creates a table with a single column for storing issue hashes.
+        """
         with self.conn:
             self.conn.execute("""
                 CREATE TABLE IF NOT EXISTS seen_issues (
@@ -18,6 +48,15 @@ class SeenIssuesDB:
             """)
 
     def mark_as_seen(self, issue_text: str):
+        """
+        Mark an issue as seen in the database.
+        
+        Computes a hash of the issue text and stores it in the database.
+        If the issue has already been marked as seen, this operation has no effect.
+        
+        Args:
+            issue_text: The text content of the issue to mark as seen.
+        """
         issue_hash = self._compute_hash(issue_text)
         with self.conn:
             self.conn.execute(
@@ -26,6 +65,17 @@ class SeenIssuesDB:
             )
 
     def has_seen(self, issue_text: str) -> bool:
+        """
+        Check if an issue has been seen before.
+        
+        Computes a hash of the issue text and checks if it exists in the database.
+        
+        Args:
+            issue_text: The text content of the issue to check.
+            
+        Returns:
+            True if the issue has been seen before, False otherwise.
+        """
         issue_hash = self._compute_hash(issue_text)
         cursor = self.conn.execute(
             'SELECT 1 FROM seen_issues WHERE issue_hash = ?',
@@ -34,4 +84,13 @@ class SeenIssuesDB:
         return cursor.fetchone() is not None
 
     def _compute_hash(self, text: str) -> str:
+        """
+        Compute a SHA-256 hash of the given text.
+        
+        Args:
+            text: The text to hash.
+            
+        Returns:
+            A hexadecimal string representation of the hash.
+        """
         return sha256(text.encode('utf-8')).hexdigest()