feat: Implement email functionality with FastAPI-Mail and Mailhog

- Updated docker-compose.yml to include Mailhog service for email testing.
- Added environment variables for email configuration in docker-compose.
- Updated requirements.txt to include fastapi-mail for email support.
- Created templates for password reset, email verification, and welcome emails.
- Developed mail utility module to handle sending emails using FastAPI-Mail.
- Added documentation for email testing with Mailhog.

app/db_migrations.py

@@ -1,22 +1,40 @@
-from sqlalchemy import text
+from sqlalchemy import text, inspect
 from .db import engine
 
+def table_exists(conn, table_name):
+    """Check if a table exists in the database."""
+    result = conn.execute(text(f"""
+        SELECT COUNT(*) as count 
+        FROM information_schema.tables 
+        WHERE table_schema = DATABASE() 
+        AND table_name = '{table_name}'
+    """))
+    return result.scalar() > 0
+
+def column_exists(conn, table_name, column_name):
+    """Check if a column exists in a table."""
+    result = conn.execute(text(f"""
+        SELECT COUNT(*) as count 
+        FROM information_schema.columns 
+        WHERE table_schema = DATABASE() 
+        AND table_name = '{table_name}' 
+        AND column_name = '{column_name}'
+    """))
+    return result.scalar() > 0
+
 def apply_migrations():
     """Apply all pending database migrations."""
     
     # Check and add OAuth columns to users table
     try:
         with engine.connect() as conn:
-            # Check if the OAuth columns exist
-            result = conn.execute(text("""
-                SELECT COUNT(*) as count 
-                FROM information_schema.columns 
-                WHERE table_schema = DATABASE() 
-                AND table_name = 'users' 
-                AND column_name = 'is_oauth_user'
-            """))
+            # Make sure tables exist before trying to alter them
+            if not table_exists(conn, 'users'):
+                print("Users table doesn't exist yet. Skipping OAuth columns migration.")
+                return
             
-            if result.fetchone()[0] == 0:
+            # Check if the OAuth columns exist
+            if not column_exists(conn, 'users', 'is_oauth_user'):
                 print("Adding OAuth columns to users table...")
                 
                 # Add the OAuth columns
@@ -34,15 +52,7 @@ def apply_migrations():
                 print("OAuth columns already exist in users table.")
             
             # Check if the is_admin column exists in the users table
-            result = conn.execute(text("""
-                SELECT COUNT(*) as count 
-                FROM information_schema.columns 
-                WHERE table_schema = DATABASE() 
-                AND table_name = 'users' 
-                AND column_name = 'is_admin'
-            """))
-            
-            if result.fetchone()[0] == 0:
+            if not column_exists(conn, 'users', 'is_admin'):
                 print("Adding is_admin column to users table...")
                 
                 # Add the is_admin column to users table
@@ -56,32 +66,27 @@ def apply_migrations():
             else:
                 print("is_admin column already exists in users table.")
             
-            # Check if the owner_id column exists in the teams table
-            result = conn.execute(text("""
-                SELECT COUNT(*) as count 
-                FROM information_schema.columns 
-                WHERE table_schema = DATABASE() 
-                AND table_name = 'teams' 
-                AND column_name = 'owner_id'
-            """))
-            
-            if result.fetchone()[0] == 0:
-                print("Adding owner_id column to teams table...")
-                
-                # Add the owner_id column to teams table
-                conn.execute(text("""
-                    ALTER TABLE teams 
-                    ADD COLUMN owner_id INT NULL,
-                    ADD CONSTRAINT fk_teams_owner
-                    FOREIGN KEY (owner_id) REFERENCES users(id)
-                    ON DELETE SET NULL
-                """))
-                
-                conn.commit()
-                print("owner_id column added successfully to teams table.")
+            # Only proceed with teams table if it exists
+            if table_exists(conn, 'teams'):
+                # Check if the owner_id column exists in the teams table
+                if not column_exists(conn, 'teams', 'owner_id'):
+                    print("Adding owner_id column to teams table...")
+                    
+                    # Add the owner_id column to teams table
+                    conn.execute(text("""
+                        ALTER TABLE teams 
+                        ADD COLUMN owner_id INT NULL,
+                        ADD CONSTRAINT fk_teams_owner
+                        FOREIGN KEY (owner_id) REFERENCES users(id)
+                        ON DELETE SET NULL
+                    """))
+                    
+                    conn.commit()
+                    print("owner_id column added successfully to teams table.")
+                else:
+                    print("owner_id column already exists in teams table.")
             else:
-                print("owner_id column already exists in teams table.")
+                print("Teams table doesn't exist yet. Skipping teams migrations.")
                 
     except Exception as e:
         print(f"Error applying migrations: {str(e)}")
-        raise