Fix centered content layout widths

backend/app/domain/documents/models.py

@@ -76,3 +76,61 @@ class Chunk:
     semantic_id: str = ""
     block_type: str = ""
     metadata: dict[str, Any] = field(default_factory=dict)
+
+
+@dataclass
+class DocumentProcessingRun:
+    """Represent one processing attempt for a document."""
+
+    run_id: str
+    doc_id: str
+    trigger_type: str
+    run_status: str
+    parser_backend: str = ""
+    chunk_backend: str = ""
+    embedding_model: str = ""
+    index_name: str = ""
+    started_at: datetime = field(default_factory=utcnow)
+    stored_at: datetime | None = None
+    parsed_at: datetime | None = None
+    indexed_at: datetime | None = None
+    finished_at: datetime | None = None
+    layout_count: int = 0
+    structure_node_count: int = 0
+    semantic_block_count: int = 0
+    vector_chunk_count: int = 0
+    chunk_count: int = 0
+    failure_stage: str = ""
+    error_message: str = ""
+    metadata: dict[str, Any] = field(default_factory=dict)
+
+
+@dataclass
+class DocumentStatusEvent:
+    """Represent a document lifecycle event emitted during processing."""
+
+    event_id: str
+    doc_id: str
+    run_id: str
+    from_status: str
+    to_status: str
+    stage: str
+    message: str = ""
+    metadata: dict[str, Any] = field(default_factory=dict)
+    occurred_at: datetime = field(default_factory=utcnow)
+
+
+@dataclass
+class DocumentArtifact:
+    """Represent a persisted artifact reference for one processing run."""
+
+    artifact_id: str
+    doc_id: str
+    run_id: str
+    artifact_type: str
+    object_name: str
+    content_type: str
+    byte_size: int = 0
+    checksum: str = ""
+    metadata: dict[str, Any] = field(default_factory=dict)
+    created_at: datetime = field(default_factory=utcnow)