Add task tags and categorization (fixes #539)

Implement the advertised 'Task tags and categorization' feature that was
listed in docs but missing from the task edit form.

- Add tags column to tasks table (String 500, comma-separated)
- Add tags field to task create and edit forms with validation
- Display tags as badges on task view page and list pages
- Add tags filter to main tasks list and My Tasks with AJAX support
- Include tags in task export (CSV) and data export
- Add tags to Task API (create, update, list with filter)
- Add tag_list property to Task model for convenient parsing

Also: fix(oidc) use domain instead of IP for HTTPS metadata fetch
to fix TLS SNI (Fixes #540)

app/models/task.py

@@ -26,6 +26,8 @@ class Task(db.Model):
     completed_at = db.Column(db.DateTime, nullable=True)
     # Gantt chart bar color (hex e.g. #3b82f6). Overrides project color when set.
     color = db.Column(db.String(7), nullable=True)
+    # Comma-separated tags for categorization
+    tags = db.Column(db.String(500), nullable=True)
 
     # Relationships
     # project relationship is defined via backref in Project model
@@ -45,6 +47,7 @@ class Task(db.Model):
         assigned_to=None,
         created_by=None,
         status="todo",
+        tags=None,
     ):
         self.project_id = project_id
         self.name = name.strip()
@@ -55,6 +58,7 @@ class Task(db.Model):
         self.assigned_to = assigned_to
         self.created_by = created_by
         self.status = status
+        self.tags = (tags.strip() or None) if tags else None
 
     def __repr__(self):
         return f"<Task {self.name} ({self.status})>"
@@ -161,6 +165,13 @@ class Task(db.Model):
         }
         return priority_classes.get(self.priority, "priority-medium")
 
+    @property
+    def tag_list(self):
+        """Get list of tags from comma-separated string"""
+        if not self.tags:
+            return []
+        return [t.strip() for t in self.tags.split(",") if t.strip()]
+
     def start_task(self):
         """Mark task as in progress"""
         if self.status == "done":
@@ -257,6 +268,8 @@ class Task(db.Model):
             "progress_percentage": self.progress_percentage,
             "is_active": self.is_active,
             "is_overdue": self.is_overdue,
+            "tags": self.tags,
+            "tag_list": self.tag_list,
         }
 
     @classmethod

app/routes/api_v1.py

@@ -1087,6 +1087,7 @@ def list_tasks():
     # Filter by project
     project_id = request.args.get("project_id", type=int)
     status = request.args.get("status")
+    tags = request.args.get("tags", "").strip() or None
     page = request.args.get("page", 1, type=int)
     per_page = request.args.get("per_page", 50, type=int)
 
@@ -1095,6 +1096,7 @@ def list_tasks():
     result = task_service.list_tasks(
         project_id=project_id,
         status=status,
+        tags=tags,
         page=page,
         per_page=per_page,
     )
@@ -1203,6 +1205,7 @@ def create_task():
         priority=data.get("priority", "medium"),
         due_date=data.get("due_date"),
         estimated_hours=data.get("estimated_hours"),
+        tags=data.get("tags"),
     )
 
     if not result.get("success"):
@@ -1258,6 +1261,8 @@ def update_task(task_id):
         update_kwargs["due_date"] = data["due_date"]
     if "estimated_hours" in data:
         update_kwargs["estimated_hours"] = data["estimated_hours"]
+    if "tags" in data:
+        update_kwargs["tags"] = data["tags"]
 
     result = task_service.update_task(task_id=task_id, user_id=g.api_user.id, **update_kwargs)
 

app/routes/tasks.py

@@ -59,6 +59,7 @@ def list_tasks():
     project_ids = parse_ids('project_id')
     assigned_to_ids = parse_ids('assigned_to')
     search = request.args.get("search", "").strip()
+    tags = request.args.get("tags", "").strip()
     overdue_param = request.args.get("overdue", "").strip().lower()
     overdue = overdue_param in ["1", "true", "on", "yes"]
 
@@ -80,6 +81,7 @@ def list_tasks():
         project_ids=project_ids if project_ids else None,
         assigned_to_ids=assigned_to_ids if assigned_to_ids else None,
         search=search if search else None,
+        tags=tags if tags else None,
         overdue=overdue,
         user_id=current_user.id,
         is_admin=current_user.is_admin,
@@ -103,6 +105,7 @@ def list_tasks():
             project_id=project_ids[0] if len(project_ids) == 1 else None,
             assigned_to=assigned_to_ids[0] if len(assigned_to_ids) == 1 else None,
             search=search,
+            tags=tags,
             overdue=overdue,
         ))
         response.headers["Content-Type"] = "text/html; charset=utf-8"
@@ -145,6 +148,7 @@ def list_tasks():
         project_id=project_ids[0] if len(project_ids) == 1 else None,
         assigned_to=assigned_to_ids[0] if len(assigned_to_ids) == 1 else None,
         search=search,
+        tags=tags,
         overdue=overdue,
         task_counts=task_counts,
     )
@@ -232,6 +236,9 @@ def create_task():
         if color_val == "":
             color_val = None
 
+        # Tags (comma-separated, max 500 chars)
+        tags_val = request.form.get("tags", "").strip()[:500] or None
+
         # Use service layer to create task
         from app.services import TaskService
 
@@ -248,6 +255,7 @@ def create_task():
             created_by=current_user.id,
             color=color_val,
             status=status,
+            tags=tags_val,
         )
 
         if not result["success"]:
@@ -469,6 +477,9 @@ def edit_task(task_id):
         task.estimated_hours = estimated_hours
         task.due_date = due_date
         task.assigned_to = assigned_to
+        # Tags (comma-separated, max 500 chars)
+        tags_val = request.form.get("tags", "").strip()[:500]
+        task.tags = tags_val or None
         # Gantt color (hex e.g. #3b82f6)
         color_val = request.form.get("color", "").strip()
         if color_val and re.match(r"^#[0-9A-Fa-f]{6}$", color_val):
@@ -1160,6 +1171,7 @@ def export_tasks():
     project_ids = parse_ids("project_id")
     assigned_to_ids = parse_ids("assigned_to")
     search = request.args.get("search", "").strip()
+    tags = request.args.get("tags", "").strip()
     overdue_param = request.args.get("overdue", "").strip().lower()
     overdue = overdue_param in ["1", "true", "on", "yes"]
 
@@ -1182,6 +1194,12 @@ def export_tasks():
         like = f"%{search}%"
         query = query.filter(db.or_(Task.name.ilike(like), Task.description.ilike(like)))
 
+    if tags:
+        tag_list = [t.strip() for t in tags.split(",") if t.strip()]
+        if tag_list:
+            tag_conditions = [Task.tags.ilike(f"%{tag}%") for tag in tag_list]
+            query = query.filter(db.or_(*tag_conditions))
+
     # Overdue filter
     if overdue:
         today_local = now_in_app_timezone().date()
@@ -1207,6 +1225,7 @@ def export_tasks():
             "Project",
             "Status",
             "Priority",
+            "Tags",
             "Assigned To",
             "Created By",
             "Due Date",
@@ -1226,6 +1245,7 @@ def export_tasks():
                 task.project.name if task.project else "",
                 task.status,
                 task.priority,
+                task.tags or "",
                 task.assigned_user.display_name if task.assigned_user else "",
                 task.creator.display_name if task.creator else "",
                 task.due_date.strftime("%Y-%m-%d") if task.due_date else "",
@@ -1263,6 +1283,7 @@ def my_tasks():
     priority = request.args.get("priority", "")
     project_id = request.args.get("project_id", type=int)
     search = request.args.get("search", "").strip()
+    tags = request.args.get("tags", "").strip()
     task_type = request.args.get("task_type", "")  # '', 'assigned', 'created'
     overdue_param = request.args.get("overdue", "").strip().lower()
     overdue = overdue_param in ["1", "true", "on", "yes"]
@@ -1291,6 +1312,12 @@ def my_tasks():
         like = f"%{search}%"
         query = query.filter(db.or_(Task.name.ilike(like), Task.description.ilike(like)))
 
+    if tags:
+        tag_list = [t.strip() for t in tags.split(",") if t.strip()]
+        if tag_list:
+            tag_conditions = [Task.tags.ilike(f"%{tag}%") for tag in tag_list]
+            query = query.filter(db.or_(*tag_conditions))
+
     # Overdue filter (uses application's local date)
     if overdue:
         today_local = now_in_app_timezone().date()
@@ -1317,6 +1344,7 @@ def my_tasks():
         priority=priority,
         project_id=project_id,
         search=search,
+        tags=tags,
         task_type=task_type,
         overdue=overdue,
     )

app/schemas/task_schema.py

@@ -17,6 +17,7 @@ class TaskSchema(Schema):
     status = fields.Str(validate=validate.OneOf([s.value for s in TaskStatus]))
     priority = fields.Str(validate=validate.OneOf(["low", "medium", "high", "urgent"]))
     due_date = fields.Date(allow_none=True)
+    tags = fields.Str(allow_none=True)
     created_by = fields.Int(required=True)
     created_at = fields.DateTime(dump_only=True)
     updated_at = fields.DateTime(dump_only=True)
@@ -35,6 +36,7 @@ class TaskCreateSchema(Schema):
     assignee_id = fields.Int(allow_none=True)
     priority = fields.Str(missing="medium", validate=validate.OneOf(["low", "medium", "high", "urgent"]))
     due_date = fields.Date(allow_none=True)
+    tags = fields.Str(allow_none=True)
 
 
 class TaskUpdateSchema(Schema):
@@ -46,3 +48,4 @@ class TaskUpdateSchema(Schema):
     status = fields.Str(allow_none=True, validate=validate.OneOf([s.value for s in TaskStatus]))
     priority = fields.Str(allow_none=True, validate=validate.OneOf(["low", "medium", "high", "urgent"]))
     due_date = fields.Date(allow_none=True)
+    tags = fields.Str(allow_none=True)

app/services/task_service.py

@@ -57,6 +57,7 @@ class TaskService:
         estimated_hours: Optional[float] = None,
         color: Optional[str] = None,
         status: Optional[str] = None,
+        tags: Optional[str] = None,
     ) -> Dict[str, Any]:
         """
         Create a new task.
@@ -98,6 +99,7 @@ class TaskService:
             estimated_hours=estimated_hours,
             status=task_status,
             created_by=created_by,
+            tags=tags,
         )
         if color:
             task.color = color
@@ -191,6 +193,7 @@ class TaskService:
         assigned_to: Optional[int] = None,
         search: Optional[str] = None,
         overdue: bool = False,
+        tags: Optional[str] = None,
         user_id: Optional[int] = None,
         is_admin: bool = False,
         has_view_all_tasks: bool = False,
@@ -252,6 +255,13 @@ class TaskService:
             like = f"%{search}%"
             query = query.filter(db.or_(Task.name.ilike(like), Task.description.ilike(like)))
 
+        # Tags filter: match tasks that have at least one of the specified tags (comma-separated)
+        if tags:
+            tag_list = [t.strip() for t in tags.split(",") if t.strip()]
+            if tag_list:
+                tag_conditions = [Task.tags.ilike(f"%{tag}%") for tag in tag_list]
+                query = query.filter(db.or_(*tag_conditions))
+
         # Overdue filter
         if overdue:
             today_local = now_in_app_timezone().date()
@@ -298,6 +308,11 @@ class TaskService:
             if search:
                 like = f"%{search}%"
                 count_query = count_query.filter(db.or_(Task.name.ilike(like), Task.description.ilike(like)))
+            if tags:
+                tag_list = [t.strip() for t in tags.split(",") if t.strip()]
+                if tag_list:
+                    tag_conditions = [Task.tags.ilike(f"%{tag}%") for tag in tag_list]
+                    count_query = count_query.filter(db.or_(*tag_conditions))
             if overdue:
                 today_local = now_in_app_timezone().date()
                 count_query = count_query.filter(Task.due_date < today_local, Task.status.in_(["todo", "in_progress", "review"]))

app/templates/tasks/_tasks_list.html

@@ -4,7 +4,7 @@
             {{ tasks|length }} task{{ 's' if tasks|length != 1 else '' }} found
         </h3>
         <div class="flex items-center gap-2">
-            <a href="{{ url_for('tasks.export_tasks', status=status, priority=priority, project_ids=project_ids|join(',') if project_ids else '', assigned_to_ids=assigned_to_ids|join(',') if assigned_to_ids else '', search=search, overdue=overdue) }}" class="px-3 py-1.5 text-sm bg-background-light dark:bg-background-dark rounded-lg hover:bg-gray-100 dark:hover:bg-gray-700 transition-colors inline-flex items-center" title="{{ _('Export to CSV') }}">
+            <a href="{{ url_for('tasks.export_tasks', status=status, priority=priority, project_ids=project_ids|join(',') if project_ids else '', assigned_to_ids=assigned_to_ids|join(',') if assigned_to_ids else '', search=search, tags=tags or '', overdue=overdue) }}" class="px-3 py-1.5 text-sm bg-background-light dark:bg-background-dark rounded-lg hover:bg-gray-100 dark:hover:bg-gray-700 transition-colors inline-flex items-center" title="{{ _('Export to CSV') }}">
                 <i class="fas fa-download mr-1"></i> Export
             </a>
             <div class="relative">
@@ -29,6 +29,7 @@
                 </th>
                 <th class="p-4" data-sortable>Name</th>
                 <th class="p-4" data-sortable>Project</th>
+                <th class="p-4">{{ _('Tags') }}</th>
                 <th class="p-4" data-sortable>Priority</th>
                 <th class="p-4" data-sortable>Status</th>
                 <th class="p-4 table-number" data-sortable>Due</th>
@@ -44,6 +45,17 @@
                 </td>
                 <td class="p-4"><a href="{{ url_for('tasks.view_task', task_id=task.id) }}" class="text-primary hover:underline">{{ task.name }}</a></td>
                 <td class="p-4"><a href="{{ url_for('projects.view_project', project_id=task.project_id) }}" class="text-primary hover:underline">{{ task.project.name }}</a></td>
+                <td class="p-4">
+                    {% if task.tag_list %}
+                    <div class="flex flex-wrap gap-1">
+                        {% for tag in task.tag_list %}
+                        <span class="inline-flex items-center px-2 py-0.5 rounded text-xs font-medium bg-gray-200 text-gray-800 dark:bg-gray-700 dark:text-gray-200">{{ tag }}</span>
+                        {% endfor %}
+                    </div>
+                    {% else %}
+                    <span class="text-text-muted-light dark:text-text-muted-dark">—</span>
+                    {% endif %}
+                </td>
                 <td class="p-4">
                     {% set p = task.priority %}
                     {% set pcls = {'low':'bg-emerald-100 text-emerald-700 dark:bg-emerald-900/30 dark:text-emerald-300',
@@ -94,7 +106,7 @@
             <i class="fas fa-question-circle mr-2"></i>Learn More
         </a>
     {% endset %}
-    {% if search or status or priority or project_id or assigned_to %}
+    {% if search or status or priority or project_id or assigned_to or tags %}
         {{ empty_state('fas fa-search', 'No Tasks Match Your Filters', 'Try adjusting your filters to see more results. You can clear filters or create a new task that matches your criteria.', actions, type='no-results') }}
     {% else %}
         {{ empty_state('fas fa-tasks', 'No Tasks Yet', 'Tasks help you break down projects into manageable pieces. Create your first task to get started organizing your work!', actions, type='no-data') }}

app/templates/tasks/create.html

@@ -115,6 +115,16 @@
                             <p class="text-xs text-text-muted-light dark:text-text-muted-dark mt-1">{{ _('Optional: Assign this task to a team member') }}</p>
                         </div>
 
+                        <!-- Tags -->
+                        <div class="mb-4">
+                            <label for="tags" class="block text-sm font-medium text-gray-700 dark:text-gray-300">
+                                <i class="fas fa-tags mr-2 text-primary"></i>{{ _('Tags') }}
+                            </label>
+                            <input type="text" class="form-input" id="tags" name="tags"
+                                   value="{{ request.form.get('tags', '') }}" placeholder="{{ _('e.g. bug, frontend, urgent') }}" maxlength="500">
+                            <p class="text-xs text-text-muted-light dark:text-text-muted-dark mt-1">{{ _('Comma-separated tags for categorization') }}</p>
+                        </div>
+
                         <!-- Gantt color -->
                         <div class="mb-4">
                             <label for="color" class="block text-sm font-medium text-gray-700 dark:text-gray-300">{{ _('Gantt color') }}</label>

app/templates/tasks/edit.html

@@ -136,6 +136,16 @@
                             <p class="text-xs text-text-muted-light dark:text-text-muted-dark mt-1">{{ _('Optional: Assign this task to a team member') }}</p>
                         </div>
 
+                        <!-- Tags -->
+                        <div class="mb-4">
+                            <label for="tags" class="block text-sm font-medium text-gray-700 dark:text-gray-300">
+                                <i class="fas fa-tags mr-2 text-primary"></i>{{ _('Tags') }}
+                            </label>
+                            <input type="text" class="form-input" id="tags" name="tags"
+                                   value="{{ task.tags or '' }}" placeholder="{{ _('e.g. bug, frontend, urgent') }}" maxlength="500">
+                            <p class="text-xs text-text-muted-light dark:text-text-muted-dark mt-1">{{ _('Comma-separated tags for categorization') }}</p>
+                        </div>
+
                         <!-- Gantt color -->
                         <div class="mb-4">
                             <label for="color" class="block text-sm font-medium text-gray-700 dark:text-gray-300">{{ _('Gantt color') }}</label>

app/templates/tasks/list.html

@@ -41,6 +41,10 @@
             <label for="search" class="block text-sm font-medium text-gray-700 dark:text-gray-300">Search</label>
             <input type="text" name="search" id="search" value="{{ search or '' }}" class="form-input">
         </div>
+        <div class="lg:col-span-1">
+            <label for="tags" class="block text-sm font-medium text-gray-700 dark:text-gray-300">{{ _('Tags') }}</label>
+            <input type="text" name="tags" id="tags" value="{{ tags or '' }}" class="form-input" placeholder="{{ _('e.g. bug, frontend') }}">
+        </div>
         <div>
             <label for="status" class="block text-sm font-medium text-gray-700 dark:text-gray-300">Status</label>
             <select name="status" id="status" class="form-input">
@@ -656,6 +660,23 @@ document.addEventListener('DOMContentLoaded', function() {
             });
         }
         
+        // Auto-submit on tags input (debounced)
+        const tagsInput = form.querySelector('input[name="tags"], input#tags');
+        if (tagsInput) {
+            tagsInput.addEventListener('input', () => {
+                debouncedSearch(500);
+            });
+            tagsInput.addEventListener('keydown', (e) => {
+                if (e.key === 'Enter') {
+                    e.preventDefault();
+                    if (searchTimeout) {
+                        clearTimeout(searchTimeout);
+                    }
+                    applyFilters();
+                }
+            });
+        }
+        
         // Prevent form submission (use AJAX instead)
         form.addEventListener('submit', (e) => {
             e.preventDefault();

app/templates/tasks/my_tasks.html

@@ -119,6 +119,11 @@
                                value="{{ search }}" placeholder="{{ _('Task name or description') }}">
                     </div>
                 </div>
+                <div class="col-md-2 col-sm-6">
+                    <label for="tags" class="form-label">{{ _('Tags') }}</label>
+                    <input type="text" class="form-control" id="tags" name="tags" 
+                           value="{{ tags }}" placeholder="{{ _('e.g. bug, frontend') }}">
+                </div>
                 <div class="col-md-2 col-sm-6">
                     <label for="status" class="form-label">{{ _('Status') }}</label>
                     <select class="form-select" id="status" name="status">
@@ -228,6 +233,14 @@
                     </p>
                     {% endif %}
                     
+                    {% if task.tag_list %}
+                    <div class="d-flex flex-wrap gap-1 mb-3">
+                        {% for tag in task.tag_list %}
+                        <span class="badge bg-secondary bg-opacity-25 text-secondary">{{ tag }}</span>
+                        {% endfor %}
+                    </div>
+                    {% endif %}
+                    
                     <!-- Project Info -->
                     <div class="d-flex align-items-center mb-3">
                         <div class="bg-primary bg-opacity-10 rounded-circle d-flex align-items-center justify-content-center me-2" style="width: 24px; height: 24px;">

app/templates/tasks/view.html

@@ -133,6 +133,16 @@
                     <p>{{ task.assigned_user.display_name }}</p>
                 </div>
                 {% endif %}
+                {% if task.tags %}
+                <div>
+                    <h3 class="text-sm font-medium text-text-muted-light dark:text-text-muted-dark">{{ _('Tags') }}</h3>
+                    <p class="flex flex-wrap gap-1">
+                        {% for tag in task.tag_list %}
+                        <span class="inline-flex items-center px-2 py-0.5 rounded text-xs font-medium bg-gray-200 text-gray-800 dark:bg-gray-700 dark:text-gray-200">{{ tag }}</span>
+                        {% endfor %}
+                    </p>
+                </div>
+                {% endif %}
                 {% if task.due_date %}
                 <div>
                     <h3 class="text-sm font-medium text-text-muted-light dark:text-text-muted-dark">Due Date</h3>

app/utils/data_export.py

@@ -443,6 +443,7 @@ def _task_to_dict(task):
         "status": task.status,
         "priority": task.priority,
         "due_date": task.due_date.isoformat() if task.due_date else None,
+        "tags": task.tags,
         "created_at": task.created_at.isoformat() if task.created_at else None,
     }
 

app/utils/oidc_metadata.py

@@ -399,7 +399,9 @@ def fetch_oidc_metadata(
         timeout: Request timeout in seconds (default: 10)
         use_dns_test: Whether to test DNS resolution first (default: True)
         dns_strategy: DNS resolution strategy - "auto", "socket", "getaddrinfo", or "both"
-        use_ip_directly: Use IP address directly if DNS resolution succeeds (default: True)
+        use_ip_directly: Use IP address directly for HTTP issuer URLs when DNS resolution
+            succeeds (default: True). For HTTPS, the request is always made to the original
+            issuer hostname to satisfy TLS SNI and virtual hosting requirements.
         use_docker_internal: Try Docker internal names if external DNS fails (default: True)
         
     Returns:
@@ -438,18 +440,12 @@ def fetch_oidc_metadata(
             "error": dns_error,
         }
         
-        if dns_success and resolved_ip and use_ip_directly:
-            # Replace hostname with IP in URL
-            # Note: We need to preserve the original hostname for Host header in HTTPS
-            # For HTTPS, we'll use the IP but set the Host header
-            if parsed.scheme == "https":
-                # For HTTPS, we can't easily use IP directly due to SNI requirements
-                # But we'll try it anyway - some servers accept it
-                metadata_url = original_metadata_url.replace(hostname, resolved_ip)
-                logger.info("Using IP address directly for metadata fetch: %s -> %s", hostname, _ip_cache._mask_ip(resolved_ip))
-            else:
-                metadata_url = original_metadata_url.replace(hostname, resolved_ip)
-                logger.info("Using IP address directly for metadata fetch: %s -> %s", hostname, _ip_cache._mask_ip(resolved_ip))
+        if dns_success and resolved_ip and use_ip_directly and parsed.scheme == "http":
+            # Replace hostname with IP in URL (HTTP only).
+            # For HTTPS, we always use the original issuer hostname - using the IP breaks
+            # TLS SNI and virtual hosting (IDPs typically require the domain in SNI/Host).
+            metadata_url = original_metadata_url.replace(hostname, resolved_ip)
+            logger.info("Using IP address directly for metadata fetch: %s -> %s", hostname, _ip_cache._mask_ip(resolved_ip))
         elif not dns_success:
             logger.warning(
                 "DNS resolution test failed for %s using %s strategy, but will attempt metadata fetch anyway",

migrations/versions/129_add_task_tags.py

@@ -0,0 +1,45 @@
+"""Add tags column to tasks table
+
+Revision ID: 129_add_task_tags
+Revises: 128_add_invoices_zugferd_pdf
+Create Date: 2026-02-28
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = "129_add_task_tags"
+down_revision = "128_add_invoices_zugferd_pdf"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    """Add tags column to tasks table for categorization."""
+    bind = op.get_bind()
+    inspector = sa.inspect(bind)
+
+    if "tasks" in inspector.get_table_names():
+        tasks_cols = {c["name"] for c in inspector.get_columns("tasks")}
+        if "tags" not in tasks_cols:
+            op.add_column(
+                "tasks",
+                sa.Column("tags", sa.String(length=500), nullable=True),
+            )
+
+
+def downgrade():
+    """Remove tags column from tasks table."""
+    bind = op.get_bind()
+    inspector = sa.inspect(bind)
+    is_sqlite = bind.dialect.name == "sqlite"
+
+    if "tasks" in inspector.get_table_names():
+        tasks_cols = {c["name"] for c in inspector.get_columns("tasks")}
+        if "tags" in tasks_cols:
+            if is_sqlite:
+                with op.batch_alter_table("tasks", schema=None) as batch_op:
+                    batch_op.drop_column("tags")
+            else:
+                op.drop_column("tasks", "tags")