changes to mobile styling in modal view, complete reword of backend worker system

app/models.py

@@ -76,3 +76,80 @@ class AppSettings(db.Model):
     key = db.Column(db.String(64), unique=True, nullable=False)
     value = db.Column(db.Text, nullable=True)
     updated_at = db.Column(db.DateTime, default=db.func.now(), onupdate=db.func.now())
+
+
+class ImportBatch(db.Model):
+    """
+    Groups related import tasks for batch tracking and reporting.
+    One batch per scan operation.
+    """
+    __tablename__ = "import_batch"
+
+    id = db.Column(db.Integer, primary_key=True)
+    source_directory = db.Column(db.String(1024), nullable=False)
+    status = db.Column(db.String(32), default='running', index=True)  # running, complete, failed, cancelled
+
+    # Statistics
+    total_files = db.Column(db.Integer, default=0)
+    processed_files = db.Column(db.Integer, default=0)
+    imported_count = db.Column(db.Integer, default=0)
+    skipped_count = db.Column(db.Integer, default=0)
+    failed_count = db.Column(db.Integer, default=0)
+
+    # Timestamps
+    started_at = db.Column(db.DateTime, default=db.func.now())
+    completed_at = db.Column(db.DateTime, nullable=True)
+
+
+class ImportTask(db.Model):
+    """
+    Tracks the state of each file being processed through the import pipeline.
+    Enables resume capability and parallel processing.
+    """
+    __tablename__ = "import_task"
+
+    id = db.Column(db.Integer, primary_key=True)
+
+    # File identification
+    source_path = db.Column(db.String(1024), nullable=False, index=True)
+    file_hash = db.Column(db.String(64), nullable=True, index=True)  # SHA256, computed during processing
+    file_size = db.Column(db.BigInteger, nullable=True)
+
+    # Classification
+    # Values: 'scan', 'import_image', 'import_archive', 'thumbnail', 'sidecar'
+    task_type = db.Column(db.String(32), nullable=False, index=True)
+
+    # State tracking
+    # Values: 'pending', 'queued', 'processing', 'complete', 'failed', 'skipped'
+    status = db.Column(db.String(32), nullable=False, default='pending', index=True)
+
+    # Celery task tracking
+    celery_task_id = db.Column(db.String(64), nullable=True, index=True)
+
+    # Context/metadata (JSON)
+    # For images: {"artist": "...", "dest_dir": "..."}
+    # For archives: {"artist": "...", "dest_dir": "...", "archive_tag": "..."}
+    # For sidecars: {"image_id": 123, "sidecar_path": "..."}
+    context = db.Column(db.JSON, nullable=True)
+
+    # Batch relationship
+    batch_id = db.Column(db.Integer, db.ForeignKey('import_batch.id', ondelete='SET NULL'), nullable=True)
+    batch = db.relationship('ImportBatch', backref=db.backref('tasks', lazy='dynamic'))
+
+    # Result tracking
+    result_image_id = db.Column(db.Integer, db.ForeignKey('image_record.id', ondelete='SET NULL'), nullable=True)
+    result_image = db.relationship('ImageRecord', foreign_keys=[result_image_id])
+    error_message = db.Column(db.Text, nullable=True)
+    retry_count = db.Column(db.Integer, default=0)
+
+    # Timestamps
+    created_at = db.Column(db.DateTime, default=db.func.now(), index=True)
+    started_at = db.Column(db.DateTime, nullable=True)
+    completed_at = db.Column(db.DateTime, nullable=True)
+
+    # Unique constraint: prevent duplicate tasks for same file+type combination
+    # Note: file_hash can be NULL initially (computed during processing)
+    __table_args__ = (
+        db.Index('ix_import_task_status_type', 'status', 'task_type'),
+        db.Index('ix_import_task_batch_status', 'batch_id', 'status'),
+    )