Add logs view for timer functions

- Create new database table `timer_function_invocations` to track function executions
- Implement `/logs/<function_id>` route in timer routes to fetch and display invocation logs
- Add new logs template for timer functions with detailed invocation information
- Update header templates to include logs URL for timer functions

routes/timer.py

@@ -101,6 +101,21 @@ AFTER INSERT OR UPDATE
 ON timer_functions
 FOR EACH ROW
 EXECUTE PROCEDURE fn_timer_functions_versioning();
+
+CREATE TABLE timer_function_invocations (
+    id SERIAL PRIMARY KEY,
+    timer_function_id INT NOT NULL,
+    status TEXT,
+    invocation_time TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    logs TEXT,
+    version_number INT NOT NULL,
+
+    CONSTRAINT fk_timer_function_invocations
+        FOREIGN KEY (timer_function_id)
+        REFERENCES timer_functions (id)
+        ON DELETE CASCADE
+);
+
 '''
 
 DEFAULT_SCRIPT = """async (req) => {
@@ -353,4 +368,38 @@ def toggle(function_id):
             "message": f"Error toggling timer function: {str(e)}"
         }), 400
 
+@timer.route('/logs/<int:function_id>')
+@login_required
+def logs(function_id):
+    # Fetch the timer function to verify ownership
+    timer_function = db.execute("""
+        SELECT id, name 
+        FROM timer_functions 
+        WHERE id = %s AND user_id = %s
+    """, [function_id, current_user.id], one=True)
+
+    if not timer_function:
+        flash('Timer function not found', 'error')
+        return redirect(url_for('timer.overview'))
+
+    # Fetch the invocation logs
+    timer_function_invocations = db.execute("""
+        SELECT id, timer_function_id, status, invocation_time, 
+               logs, version_number
+        FROM timer_function_invocations 
+        WHERE timer_function_id = %s
+        ORDER BY invocation_time DESC
+        LIMIT 100
+    """, [function_id])
+
+    args = {
+        'user_id': current_user.id,
+        'function_id': function_id,
+        'timer_function_invocations': timer_function_invocations
+    }
+
+    if htmx:
+        return render_block(environment, 'dashboard/timer_functions/logs.html', 'page', **args)
+    return render_template('dashboard/timer_functions/logs.html', **args)
+