Missing ijson

[ci skip]

docker/rootfs/etc/s6-overlay/s6-rc.d/init-migrations/run

@@ -8,6 +8,11 @@ echo "${log_prefix} Apply database migrations..."
 
 cd "${PAPERLESS_SRC_DIR}"
 
+if [[ "${PAPERLESS_MIGRATION_MODE:-0}" == "1" ]]; then
+	echo "${log_prefix} Migration mode enabled, skipping migrations."
+	exit 0
+fi
+
 # The whole migrate, with flock, needs to run as the right user
 if [[ -n "${USER_IS_NON_ROOT}" ]]; then
 	exec s6-setlock -n "${data_dir}/migration_lock" python3 manage.py migrate --skip-checks --no-input

docker/rootfs/etc/s6-overlay/s6-rc.d/init-system-checks/run

@@ -9,7 +9,15 @@ echo "${log_prefix} Running Django checks"
 cd "${PAPERLESS_SRC_DIR}"
 
 if [[ -n "${USER_IS_NON_ROOT}" ]]; then
-	python3 manage.py check
+	if [[ "${PAPERLESS_MIGRATION_MODE:-0}" == "1" ]]; then
+		python3 manage_migration.py check
+	else
+		python3 manage.py check
+	fi
 else
-	s6-setuidgid paperless python3 manage.py check
+	if [[ "${PAPERLESS_MIGRATION_MODE:-0}" == "1" ]]; then
+		s6-setuidgid paperless python3 manage_migration.py check
+	else
+		s6-setuidgid paperless python3 manage.py check
+	fi
 fi

docker/rootfs/etc/s6-overlay/s6-rc.d/svc-webserver/run

@@ -13,8 +13,14 @@ if [[ -n "${PAPERLESS_FORCE_SCRIPT_NAME}" ]]; then
 	export GRANIAN_URL_PATH_PREFIX=${PAPERLESS_FORCE_SCRIPT_NAME}
 fi
 
-if [[ -n "${USER_IS_NON_ROOT}" ]]; then
+if [[ "${PAPERLESS_MIGRATION_MODE:-0}" == "1" ]]; then
-	exec granian --interface asginl --ws --loop uvloop "paperless.asgi:application"
+	app_module="paperless.migration_asgi:application"
 else
-	exec s6-setuidgid paperless granian --interface asginl --ws --loop uvloop "paperless.asgi:application"
+	app_module="paperless.asgi:application"
+fi
+
+if [[ -n "${USER_IS_NON_ROOT}" ]]; then
+	exec granian --interface asginl --ws --loop uvloop "${app_module}"
+else
+	exec s6-setuidgid paperless granian --interface asginl --ws --loop uvloop "${app_module}"
 fi

pyproject.toml

@@ -49,6 +49,8 @@ dependencies = [
   "flower~=2.0.1",
   "gotenberg-client~=0.13.1",
   "httpx-oauth~=0.16",
+  "ijson",
+  "ijson~=3.3",
   "imap-tools~=1.11.0",
   "jinja2~=3.1.5",
   "langdetect~=1.0.9",
@@ -72,6 +74,7 @@ dependencies = [
   "rapidfuzz~=3.14.0",
   "redis[hiredis]~=5.2.1",
   "regex>=2025.9.18",
+  "rich~=14.1.0",
   "scikit-learn~=1.7.0",
   "sentence-transformers>=4.1",
   "setproctitle~=1.3.4",

src/manage.py

@@ -3,7 +3,12 @@ import os
 import sys
 
 if __name__ == "__main__":
-    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "paperless.settings")
+    try:
+        from paperless_migration.detect import choose_settings_module
+
+        os.environ.setdefault("DJANGO_SETTINGS_MODULE", choose_settings_module())
+    except Exception:
+        os.environ.setdefault("DJANGO_SETTINGS_MODULE", "paperless.settings")
 
     from django.core.management import execute_from_command_line
 

src/manage_migration.py

@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+import os
+import sys
+
+if __name__ == "__main__":
+    os.environ.setdefault(
+        "DJANGO_SETTINGS_MODULE",
+        "paperless_migration.settings",
+    )
+
+    from django.core.management import execute_from_command_line
+
+    execute_from_command_line(sys.argv)

src/paperless/asgi.py

@@ -1,12 +1,18 @@
 import os
 
+try:
+    from paperless_migration.detect import choose_settings_module
+
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", choose_settings_module())
+except Exception:
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "paperless.settings")
+
 from django.core.asgi import get_asgi_application
 
 # Fetch Django ASGI application early to ensure AppRegistry is populated
 # before importing consumers and AuthMiddlewareStack that may import ORM
 # models.
 
-os.environ.setdefault("DJANGO_SETTINGS_MODULE", "paperless.settings")
 django_asgi_app = get_asgi_application()
 
 from channels.auth import AuthMiddlewareStack  # noqa: E402

src/paperless/migration_asgi.py

@@ -0,0 +1,7 @@
+import os
+
+from django.core.asgi import get_asgi_application
+
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "paperless_migration.settings")
+
+application = get_asgi_application()

src/paperless/wsgi.py

@@ -9,9 +9,14 @@ https://docs.djangoproject.com/en/1.10/howto/deployment/wsgi/
 
 import os
 
-from django.core.wsgi import get_wsgi_application
+try:
+    from paperless_migration.detect import choose_settings_module
 
-os.environ.setdefault("DJANGO_SETTINGS_MODULE", "paperless.settings")
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", choose_settings_module())
+except Exception:
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "paperless.settings")
+
+from django.core.wsgi import get_wsgi_application
 
 application = get_wsgi_application()
 

src/paperless_migration/apps.py

@@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class PaperlessMigrationConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "paperless_migration"

src/paperless_migration/asgi.py

@@ -0,0 +1,28 @@
+"""ASGI application for migration mode with WebSocket support."""
+
+from __future__ import annotations
+
+import os
+
+from channels.auth import AuthMiddlewareStack
+from channels.routing import ProtocolTypeRouter
+from channels.routing import URLRouter
+from channels.security.websocket import AllowedHostsOriginValidator
+from django.core.asgi import get_asgi_application
+
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "paperless_migration.settings")
+
+# Initialize Django ASGI application early to ensure settings are loaded
+django_asgi_app = get_asgi_application()
+
+# Import routing after Django is initialized
+from paperless_migration.routing import websocket_urlpatterns  # noqa: E402
+
+application = ProtocolTypeRouter(
+    {
+        "http": django_asgi_app,
+        "websocket": AllowedHostsOriginValidator(
+            AuthMiddlewareStack(URLRouter(websocket_urlpatterns)),
+        ),
+    },
+)

src/paperless_migration/consumers.py

@@ -0,0 +1,245 @@
+"""WebSocket consumers for migration operations."""
+
+from __future__ import annotations
+
+import json
+import logging
+import os
+import shutil
+import tempfile
+from pathlib import Path
+from typing import Any
+
+from channels.generic.websocket import AsyncWebsocketConsumer
+from django.conf import settings
+
+from paperless_migration.services.importer import ImportService
+from paperless_migration.services.transform import TransformService
+
+logger = logging.getLogger(__name__)
+
+
+class MigrationConsumerBase(AsyncWebsocketConsumer):
+    """Base consumer with common authentication and messaging logic."""
+
+    async def connect(self) -> None:
+        """Authenticate and accept or reject the connection."""
+        user = self.scope.get("user")
+        session = self.scope.get("session", {})
+
+        if not user or not user.is_authenticated:
+            logger.warning("WebSocket connection rejected: not authenticated")
+            await self.close(code=4001)
+            return
+
+        if not user.is_superuser:
+            logger.warning("WebSocket connection rejected: not superuser")
+            await self.close(code=4003)
+            return
+
+        if not session.get("migration_code_ok"):
+            logger.warning("WebSocket connection rejected: migration code not verified")
+            await self.close(code=4002)
+            return
+
+        await self.accept()
+        logger.info("WebSocket connection accepted for user: %s", user.username)
+
+    async def disconnect(self, close_code: int) -> None:
+        """Handle disconnection."""
+        logger.debug("WebSocket disconnected with code: %d", close_code)
+
+    async def receive(self, text_data: str | None = None, **kwargs: Any) -> None:
+        """Handle incoming messages - triggers the operation."""
+        if text_data is None:
+            return
+
+        try:
+            data = json.loads(text_data)
+        except json.JSONDecodeError:
+            await self.send_error("Invalid JSON message")
+            return
+
+        action = data.get("action")
+        if action == "start":
+            await self.run_operation()
+        else:
+            await self.send_error(f"Unknown action: {action}")
+
+    async def run_operation(self) -> None:
+        """Override in subclasses to run the specific operation."""
+        raise NotImplementedError
+
+    async def send_message(self, msg_type: str, **kwargs: Any) -> None:
+        """Send a typed JSON message to the client."""
+        await self.send(text_data=json.dumps({"type": msg_type, **kwargs}))
+
+    async def send_log(self, message: str, level: str = "info") -> None:
+        """Send a log message."""
+        await self.send_message("log", message=message, level=level)
+
+    async def send_progress(
+        self,
+        current: int,
+        total: int | None = None,
+        label: str = "",
+    ) -> None:
+        """Send a progress update."""
+        await self.send_message(
+            "progress",
+            current=current,
+            total=total,
+            label=label,
+        )
+
+    async def send_stats(self, stats: dict[str, Any]) -> None:
+        """Send statistics update."""
+        await self.send_message("stats", **stats)
+
+    async def send_complete(
+        self,
+        duration: float,
+        *,
+        success: bool,
+        **kwargs: Any,
+    ) -> None:
+        """Send completion message."""
+        await self.send_message(
+            "complete",
+            success=success,
+            duration=duration,
+            **kwargs,
+        )
+
+    async def send_error(self, message: str) -> None:
+        """Send an error message."""
+        await self.send_message("error", message=message)
+
+
+class TransformConsumer(MigrationConsumerBase):
+    """WebSocket consumer for transform operations."""
+
+    async def run_operation(self) -> None:
+        """Run the transform operation."""
+        input_path = Path(settings.MIGRATION_EXPORT_PATH)
+        output_path = Path(settings.MIGRATION_TRANSFORMED_PATH)
+        frequency = settings.MIGRATION_PROGRESS_FREQUENCY
+
+        if not input_path.exists():
+            await self.send_error(f"Export file not found: {input_path}")
+            return
+
+        if output_path.exists():
+            await self.send_error(
+                f"Output file already exists: {output_path}. "
+                "Delete it first to re-run transform.",
+            )
+            return
+
+        await self.send_log("Starting transform operation...")
+
+        service = TransformService(
+            input_path=input_path,
+            output_path=output_path,
+            update_frequency=frequency,
+        )
+
+        try:
+            async for update in service.run_async():
+                match update["type"]:
+                    case "progress":
+                        await self.send_progress(
+                            current=update["completed"],
+                            label=f"{update['completed']:,} rows processed",
+                        )
+                        if update.get("stats"):
+                            await self.send_stats({"transformed": update["stats"]})
+                    case "complete":
+                        await self.send_complete(
+                            success=True,
+                            duration=update["duration"],
+                            total_processed=update["total_processed"],
+                            stats=update["stats"],
+                            speed=update["speed"],
+                        )
+                    case "error":
+                        await self.send_error(update["message"])
+                    case "log":
+                        await self.send_log(
+                            update["message"],
+                            update.get("level", "info"),
+                        )
+        except Exception as exc:
+            logger.exception("Transform operation failed")
+            await self.send_error(f"Transform failed: {exc}")
+
+
+class ImportConsumer(MigrationConsumerBase):
+    """WebSocket consumer for import operations."""
+
+    async def run_operation(self) -> None:
+        """Run the import operation (wipe, migrate, import)."""
+        export_path = Path(settings.MIGRATION_EXPORT_PATH)
+        transformed_path = Path(settings.MIGRATION_TRANSFORMED_PATH)
+        imported_marker = Path(settings.MIGRATION_IMPORTED_PATH)
+        source_dir = export_path.parent
+
+        if not export_path.exists():
+            await self.send_error("Export file not found. Upload or re-check export.")
+            return
+
+        if not transformed_path.exists():
+            await self.send_error("Transformed file not found. Run transform first.")
+            return
+
+        await self.send_log("Preparing import operation...")
+
+        # Backup original manifest and swap in transformed version
+        backup_path: Path | None = None
+        try:
+            backup_fd, backup_name = tempfile.mkstemp(
+                prefix="manifest.v2.",
+                suffix=".json",
+                dir=source_dir,
+            )
+            os.close(backup_fd)
+            backup_path = Path(backup_name)
+            shutil.copy2(export_path, backup_path)
+            shutil.copy2(transformed_path, export_path)
+            await self.send_log("Manifest files prepared")
+        except Exception as exc:
+            await self.send_error(f"Failed to prepare import manifest: {exc}")
+            return
+
+        service = ImportService(
+            source_dir=source_dir,
+            imported_marker=imported_marker,
+        )
+
+        try:
+            async for update in service.run_async():
+                match update["type"]:
+                    case "phase":
+                        await self.send_log(f"Phase: {update['phase']}", level="info")
+                    case "log":
+                        await self.send_log(
+                            update["message"],
+                            update.get("level", "info"),
+                        )
+                    case "complete":
+                        await self.send_complete(
+                            success=update["success"],
+                            duration=update["duration"],
+                        )
+                    case "error":
+                        await self.send_error(update["message"])
+        except Exception as exc:
+            logger.exception("Import operation failed")
+            await self.send_error(f"Import failed: {exc}")
+        finally:
+            # Restore original manifest
+            if backup_path and backup_path.exists():
+                try:
+                    shutil.move(str(backup_path), str(export_path))
+                except Exception as exc:
+                    logger.warning("Failed to restore backup manifest: %s", exc)

src/paperless_migration/detect.py

@@ -0,0 +1,150 @@
+"""Lightweight detection to decide if we should boot migration mode."""
+
+from __future__ import annotations
+
+import logging
+import os
+import sqlite3
+from pathlib import Path
+from typing import Any
+
+logger = logging.getLogger(__name__)
+
+BASE_DIR = Path(__file__).resolve().parent.parent
+
+_DOC_EXISTS_QUERY = "SELECT 1 FROM documents_document LIMIT 1;"
+
+
+def _get_db_config() -> dict[str, Any]:
+    data_dir = Path(os.getenv("PAPERLESS_DATA_DIR", BASE_DIR.parent / "data")).resolve()
+    if not os.getenv("PAPERLESS_DBHOST"):
+        return {
+            "ENGINE": "sqlite",
+            "NAME": data_dir / "db.sqlite3",
+        }
+
+    engine = "mariadb" if os.getenv("PAPERLESS_DBENGINE") == "mariadb" else "postgres"
+    cfg = {
+        "ENGINE": engine,
+        "HOST": os.getenv("PAPERLESS_DBHOST"),
+        "PORT": os.getenv("PAPERLESS_DBPORT"),
+        "NAME": os.getenv("PAPERLESS_DBNAME", "paperless"),
+        "USER": os.getenv("PAPERLESS_DBUSER", "paperless"),
+        "PASSWORD": os.getenv("PAPERLESS_DBPASS", "paperless"),
+    }
+    return cfg
+
+
+def _probe_sqlite(path: Path) -> bool:
+    if not path.exists():
+        return False
+    try:
+        conn = sqlite3.connect(path, timeout=1)
+        cur = conn.cursor()
+        cur.execute(_DOC_EXISTS_QUERY)
+        cur.fetchone()
+        return True
+    except sqlite3.Error:
+        return False
+    finally:
+        try:
+            conn.close()
+        except Exception:
+            pass
+
+
+def _probe_postgres(cfg: dict[str, Any]) -> bool:
+    try:
+        import psycopg
+    except ImportError:  # pragma: no cover
+        logger.debug("psycopg not installed; skipping postgres probe")
+        return False
+
+    try:
+        conn = psycopg.connect(
+            host=cfg["HOST"],
+            port=cfg["PORT"],
+            dbname=cfg["NAME"],
+            user=cfg["USER"],
+            password=cfg["PASSWORD"],
+            connect_timeout=2,
+        )
+        with conn, conn.cursor() as cur:
+            cur.execute(_DOC_EXISTS_QUERY)
+            cur.fetchone()
+        return True
+    except Exception:
+        return False
+    finally:
+        try:
+            conn.close()
+        except Exception:
+            pass
+
+
+def _probe_mariadb(cfg: dict[str, Any]) -> bool:
+    try:
+        import MySQLdb  # type: ignore
+    except ImportError:  # pragma: no cover
+        logger.debug("mysqlclient not installed; skipping mariadb probe")
+        return False
+
+    try:
+        conn = MySQLdb.connect(
+            host=cfg["HOST"],
+            port=int(cfg["PORT"] or 3306),
+            user=cfg["USER"],
+            passwd=cfg["PASSWORD"],
+            db=cfg["NAME"],
+            connect_timeout=2,
+        )
+        cur = conn.cursor()
+        cur.execute("SELECT 1 FROM documents_document LIMIT 1;")
+        cur.fetchone()
+        return True
+    except Exception:
+        return False
+    finally:
+        try:
+            conn.close()
+        except Exception:
+            pass
+
+
+def is_v2_database() -> bool:
+    cfg = _get_db_config()
+    if cfg["ENGINE"] == "sqlite":
+        return _probe_sqlite(cfg["NAME"])
+    if cfg["ENGINE"] == "postgres":
+        return _probe_postgres(cfg)
+    if cfg["ENGINE"] == "mariadb":
+        return _probe_mariadb(cfg)
+    return False
+
+
+def choose_settings_module() -> str:
+    # ENV override
+    toggle = os.getenv("PAPERLESS_MIGRATION_MODE")
+    if toggle is not None:
+        chosen = (
+            "paperless_migration.settings"
+            if str(toggle).lower() in ("1", "true", "yes", "on")
+            else "paperless.settings"
+        )
+        os.environ["PAPERLESS_MIGRATION_MODE"] = "1" if "migration" in chosen else "0"
+        return chosen
+
+    # Auto-detect via DB probe
+    if is_v2_database():
+        logger.warning("Detected v2 schema; booting migration mode.")
+        os.environ["PAPERLESS_MIGRATION_MODE"] = "1"
+        return "paperless_migration.settings"
+
+    os.environ["PAPERLESS_MIGRATION_MODE"] = "0"
+    return "paperless.settings"
+
+
+if __name__ == "__main__":  # pragma: no cover
+    logger.info(
+        "v2 database detected" if is_v2_database() else "v2 database not detected",
+    )

src/paperless_migration/routing.py

@@ -0,0 +1,13 @@
+"""WebSocket URL routing for migration operations."""
+
+from __future__ import annotations
+
+from django.urls import path
+
+from paperless_migration.consumers import ImportConsumer
+from paperless_migration.consumers import TransformConsumer
+
+websocket_urlpatterns = [
+    path("ws/migration/transform/", TransformConsumer.as_asgi()),
+    path("ws/migration/import/", ImportConsumer.as_asgi()),
+]

src/paperless_migration/services/importer.py

@@ -0,0 +1,186 @@
+"""Import service for loading transformed data into v3 database."""
+
+from __future__ import annotations
+
+import subprocess
+import sys
+import time
+from dataclasses import dataclass
+from pathlib import Path
+from typing import TYPE_CHECKING
+from typing import TypedDict
+
+if TYPE_CHECKING:
+    from collections.abc import AsyncGenerator
+    from collections.abc import Generator
+
+
+class ProgressUpdate(TypedDict, total=False):
+    """Progress update message structure."""
+
+    type: str
+    phase: str
+    message: str
+    level: str
+    success: bool
+    duration: float
+    return_code: int
+
+
+@dataclass
+class ImportService:
+    """Service for importing transformed data into v3 database.
+
+    This service orchestrates the three-phase import process:
+    1. Wipe the existing database
+    2. Run Django migrations for v3 schema
+    3. Import the transformed data
+    """
+
+    source_dir: Path
+    imported_marker: Path
+    manage_path: Path | None = None
+
+    def __post_init__(self) -> None:
+        if self.manage_path is None:
+            # Default to manage.py in the src directory
+            self.manage_path = (
+                Path(__file__).resolve().parent.parent.parent / "manage.py"
+            )
+
+    def _get_env(self) -> dict[str, str]:
+        """Get environment variables for subprocess calls."""
+        import os
+
+        env = os.environ.copy()
+        env["DJANGO_SETTINGS_MODULE"] = "paperless.settings"
+        env["PAPERLESS_MIGRATION_MODE"] = "0"
+        return env
+
+    def _run_command(
+        self,
+        args: list[str],
+        label: str,
+    ) -> Generator[ProgressUpdate, None, int]:
+        """Run a command and yield log lines. Returns the return code."""
+        yield {"type": "log", "message": f"Running: {label}", "level": "info"}
+
+        process = subprocess.Popen(
+            args,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
+            bufsize=1,
+            text=True,
+            env=self._get_env(),
+        )
+
+        try:
+            if process.stdout:
+                for line in process.stdout:
+                    yield {
+                        "type": "log",
+                        "message": line.rstrip(),
+                        "level": "info",
+                    }
+            process.wait()
+            return process.returncode
+        finally:
+            if process.poll() is None:
+                process.kill()
+
+    def run_sync(self) -> Generator[ProgressUpdate, None, None]:
+        """Run the import synchronously, yielding progress updates.
+
+        This orchestrates:
+        1. Database wipe
+        2. Django migrations
+        3. Document import
+        """
+        start_time = time.perf_counter()
+
+        # Phase 1: Wipe database
+        yield {"type": "phase", "phase": "wipe"}
+        wipe_cmd = [
+            sys.executable,
+            "-m",
+            "paperless_migration.services.wipe_db",
+        ]
+        wipe_code = yield from self._run_command(wipe_cmd, "Database wipe")
+
+        if wipe_code != 0:
+            yield {
+                "type": "error",
+                "message": f"Database wipe failed with code {wipe_code}",
+            }
+            return
+
+        yield {"type": "log", "message": "Database wipe complete", "level": "info"}
+
+        # Phase 2: Run migrations
+        yield {"type": "phase", "phase": "migrate"}
+        migrate_cmd = [
+            sys.executable,
+            str(self.manage_path),
+            "migrate",
+            "--noinput",
+        ]
+        migrate_code = yield from self._run_command(migrate_cmd, "Django migrations")
+
+        if migrate_code != 0:
+            yield {
+                "type": "error",
+                "message": f"Migrations failed with code {migrate_code}",
+            }
+            return
+
+        yield {"type": "log", "message": "Migrations complete", "level": "info"}
+
+        # Phase 3: Import data
+        yield {"type": "phase", "phase": "import"}
+        import_cmd = [
+            sys.executable,
+            str(self.manage_path),
+            "document_importer",
+            str(self.source_dir),
+            "--data-only",
+        ]
+        import_code = yield from self._run_command(import_cmd, "Document import")
+
+        if import_code != 0:
+            yield {
+                "type": "error",
+                "message": f"Import failed with code {import_code}",
+            }
+            return
+
+        # Mark import as complete
+        try:
+            self.imported_marker.parent.mkdir(parents=True, exist_ok=True)
+            self.imported_marker.write_text("ok\n", encoding="utf-8")
+        except Exception as exc:
+            yield {
+                "type": "log",
+                "message": f"Warning: Could not write import marker: {exc}",
+                "level": "warning",
+            }
+
+        end_time = time.perf_counter()
+        duration = end_time - start_time
+
+        yield {
+            "type": "complete",
+            "success": True,
+            "duration": duration,
+        }
+
+    async def run_async(self) -> AsyncGenerator[ProgressUpdate, None]:
+        """Run the import asynchronously, yielding progress updates.
+
+        This wraps the synchronous implementation to work with async consumers.
+        """
+        import asyncio
+
+        for update in self.run_sync():
+            yield update
+            # Yield control to the event loop
+            await asyncio.sleep(0)

src/paperless_migration/services/transform.py

@@ -0,0 +1,173 @@
+"""Transform service for converting v2 exports to v3 format."""
+
+from __future__ import annotations
+
+import json
+import time
+from collections import Counter
+from collections.abc import AsyncGenerator
+from collections.abc import Callable
+from collections.abc import Generator
+from dataclasses import dataclass
+from dataclasses import field
+from typing import TYPE_CHECKING
+from typing import Any
+from typing import TypedDict
+
+import ijson
+
+if TYPE_CHECKING:
+    from pathlib import Path
+
+
+class FixtureObject(TypedDict):
+    """Structure of a Django fixture object."""
+
+    model: str
+    pk: int
+    fields: dict[str, Any]
+
+
+class ProgressUpdate(TypedDict, total=False):
+    """Progress update message structure."""
+
+    type: str
+    completed: int
+    stats: dict[str, int]
+    message: str
+    level: str
+    duration: float
+    total_processed: int
+    speed: float
+
+
+TransformFn = Callable[[FixtureObject], FixtureObject]
+
+
+def transform_documents_document(obj: FixtureObject) -> FixtureObject:
+    """Transform a documents.document fixture object for v3 schema."""
+    fields: dict[str, Any] = obj["fields"]
+    fields.pop("storage_type", None)
+    content: Any = fields.get("content")
+    fields["content_length"] = len(content) if isinstance(content, str) else 0
+    return obj
+
+
+# Registry of model-specific transforms
+TRANSFORMS: dict[str, TransformFn] = {
+    "documents.document": transform_documents_document,
+}
+
+
+@dataclass
+class TransformService:
+    """Service for transforming v2 exports to v3 format.
+
+    This service processes JSON fixtures incrementally using ijson for
+    memory-efficient streaming, and yields progress updates suitable
+    for WebSocket transmission.
+    """
+
+    input_path: Path
+    output_path: Path
+    update_frequency: int = 100
+    _stats: Counter[str] = field(default_factory=Counter, init=False)
+    _total_processed: int = field(default=0, init=False)
+
+    def validate(self) -> str | None:
+        """Validate preconditions for transform. Returns error message or None."""
+        if not self.input_path.exists():
+            return f"Input file not found: {self.input_path}"
+        if self.output_path.exists():
+            return f"Output file already exists: {self.output_path}"
+        if self.input_path.resolve() == self.output_path.resolve():
+            return "Input and output paths cannot be the same file"
+        return None
+
+    def _process_fixture(self, obj: FixtureObject) -> FixtureObject:
+        """Apply any registered transforms to a fixture object."""
+        model: str = obj["model"]
+        transform: TransformFn | None = TRANSFORMS.get(model)
+        if transform:
+            obj = transform(obj)
+            self._stats[model] += 1
+        return obj
+
+    def run_sync(self) -> Generator[ProgressUpdate, None, None]:
+        """Run the transform synchronously, yielding progress updates.
+
+        This is the core implementation that processes the JSON file
+        and yields progress updates at regular intervals.
+        """
+        error = self.validate()
+        if error:
+            yield {"type": "error", "message": error}
+            return
+
+        self._stats.clear()
+        self._total_processed = 0
+        start_time = time.perf_counter()
+
+        yield {"type": "log", "message": "Opening input file...", "level": "info"}
+
+        try:
+            with (
+                self.input_path.open("rb") as infile,
+                self.output_path.open("w", encoding="utf-8") as outfile,
+            ):
+                outfile.write("[\n")
+                first = True
+
+                for i, obj in enumerate(ijson.items(infile, "item")):
+                    fixture: FixtureObject = obj
+                    fixture = self._process_fixture(fixture)
+                    self._total_processed += 1
+
+                    if not first:
+                        outfile.write(",\n")
+                    first = False
+
+                    json.dump(fixture, outfile, ensure_ascii=False)
+
+                    # Yield progress at configured frequency
+                    if i > 0 and i % self.update_frequency == 0:
+                        yield {
+                            "type": "progress",
+                            "completed": self._total_processed,
+                            "stats": dict(self._stats),
+                        }
+
+                outfile.write("\n]\n")
+
+        except Exception as exc:
+            # Clean up partial output on error
+            if self.output_path.exists():
+                self.output_path.unlink()
+            yield {"type": "error", "message": str(exc)}
+            return
+
+        end_time = time.perf_counter()
+        duration = end_time - start_time
+        speed = self._total_processed / duration if duration > 0 else 0
+
+        yield {
+            "type": "complete",
+            "duration": duration,
+            "total_processed": self._total_processed,
+            "stats": dict(self._stats),
+            "speed": speed,
+        }
+
+    async def run_async(self) -> AsyncGenerator[ProgressUpdate, None]:
+        """Run the transform asynchronously, yielding progress updates.
+
+        This wraps the synchronous implementation to work with async consumers.
+        The actual I/O is done synchronously since ijson doesn't support async,
+        but we yield control periodically to keep the event loop responsive.
+        """
+        import asyncio
+
+        for update in self.run_sync():
+            yield update
+            # Yield control to the event loop periodically
+            await asyncio.sleep(0)

src/paperless_migration/services/wipe_db.py

@@ -0,0 +1,115 @@
+"""Database wipe service for migration import process.
+
+This module can be run as a script via:
+    python -m paperless_migration.services.wipe_db
+
+It uses the paperless_migration settings to wipe all tables
+before running v3 migrations.
+"""
+
+from __future__ import annotations
+
+import logging
+import sys
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from django.db.backends.base.base import BaseDatabaseWrapper
+
+logger = logging.getLogger(__name__)
+
+
+def _get_target_tables(connection: BaseDatabaseWrapper) -> list[str]:
+    """Get list of tables to drop that exist in the database."""
+    from django.apps import apps
+    from django.db.migrations.recorder import MigrationRecorder
+
+    model_tables = {
+        model._meta.db_table for model in apps.get_models(include_auto_created=True)
+    }
+    model_tables.add(MigrationRecorder.Migration._meta.db_table)
+    existing_tables = set(connection.introspection.table_names())
+    return sorted(model_tables & existing_tables)
+
+
+def _drop_sqlite_tables(connection: BaseDatabaseWrapper) -> int:
+    """Drop tables for SQLite database. Returns count of tables dropped."""
+    tables = _get_target_tables(connection)
+    with connection.cursor() as cursor:
+        cursor.execute("PRAGMA foreign_keys=OFF;")
+        for table in tables:
+            cursor.execute(f'DROP TABLE IF EXISTS "{table}";')
+        cursor.execute("PRAGMA foreign_keys=ON;")
+    return len(tables)
+
+
+def _drop_postgres_tables(connection: BaseDatabaseWrapper) -> int:
+    """Drop tables for PostgreSQL database. Returns count of tables dropped."""
+    tables = _get_target_tables(connection)
+    if not tables:
+        return 0
+    with connection.cursor() as cursor:
+        for table in tables:
+            cursor.execute(f'DROP TABLE IF EXISTS "{table}" CASCADE;')
+    return len(tables)
+
+
+def _drop_mysql_tables(connection: BaseDatabaseWrapper) -> int:
+    """Drop tables for MySQL/MariaDB database. Returns count of tables dropped."""
+    tables = _get_target_tables(connection)
+    with connection.cursor() as cursor:
+        cursor.execute("SET FOREIGN_KEY_CHECKS=0;")
+        for table in tables:
+            cursor.execute(f"DROP TABLE IF EXISTS `{table}`;")
+        cursor.execute("SET FOREIGN_KEY_CHECKS=1;")
+    return len(tables)
+
+
+def wipe_database() -> tuple[bool, str]:
+    """Wipe all application tables from the database.
+
+    Returns:
+        Tuple of (success: bool, message: str)
+    """
+    from django.db import connection
+
+    vendor = connection.vendor
+    logger.info("Wiping database for vendor: %s", vendor)
+
+    try:
+        match vendor:
+            case "sqlite":
+                count = _drop_sqlite_tables(connection)
+            case "postgresql":
+                count = _drop_postgres_tables(connection)
+            case "mysql":
+                count = _drop_mysql_tables(connection)
+            case _:
+                return False, f"Unsupported database vendor: {vendor}"
+
+        message = f"Dropped {count} tables from {vendor} database"
+        logger.info(message)
+        return True, message
+
+    except Exception as exc:
+        message = f"Failed to wipe database: {exc}"
+        logger.exception(message)
+        return False, message
+
+
+def main() -> int:
+    """Entry point when run as a script."""
+    import os
+
+    import django
+
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "paperless_migration.settings")
+    django.setup()
+
+    success, message = wipe_database()
+    print(message)  # noqa: T201
+    return 0 if success else 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())

src/paperless_migration/settings.py

@@ -0,0 +1,245 @@
+"""Settings for migration-mode Django instance."""
+
+from __future__ import annotations
+
+import logging
+import os
+from pathlib import Path
+from typing import Any
+
+from dotenv import load_dotenv
+
+BASE_DIR = Path(__file__).resolve().parent.parent
+
+DEBUG = os.getenv("PAPERLESS_DEBUG", "false").lower() == "true"
+
+ALLOWED_HOSTS = ["*"]
+
+# Tap paperless.conf if it's available
+for path in [
+    os.getenv("PAPERLESS_CONFIGURATION_PATH"),
+    "../paperless.conf",
+    "/etc/paperless.conf",
+    "/usr/local/etc/paperless.conf",
+]:
+    if path and Path(path).exists():
+        load_dotenv(path)
+        break
+
+
+def __get_path(
+    key: str,
+    default: str | Path,
+) -> Path:
+    if key in os.environ:
+        return Path(os.environ[key]).resolve()
+    return Path(default).resolve()
+
+
+DATA_DIR = __get_path("PAPERLESS_DATA_DIR", BASE_DIR.parent / "data")
+EXPORT_DIR = __get_path("PAPERLESS_EXPORT_DIR", BASE_DIR.parent / "export")
+
+
+def _parse_redis_url() -> str:
+    """Parse Redis URL from environment with sensible defaults."""
+    return os.getenv("PAPERLESS_REDIS_URL", "redis://localhost:6379")
+
+
+def _parse_db_settings() -> dict[str, dict[str, Any]]:
+    databases: dict[str, dict[str, Any]] = {
+        "default": {
+            "ENGINE": "django.db.backends.sqlite3",
+            "NAME": DATA_DIR / "db.sqlite3",
+            "OPTIONS": {},
+        },
+    }
+    if os.getenv("PAPERLESS_DBHOST"):
+        databases["sqlite"] = databases["default"].copy()
+        databases["default"] = {
+            "HOST": os.getenv("PAPERLESS_DBHOST"),
+            "NAME": os.getenv("PAPERLESS_DBNAME", "paperless"),
+            "USER": os.getenv("PAPERLESS_DBUSER", "paperless"),
+            "PASSWORD": os.getenv("PAPERLESS_DBPASS", "paperless"),
+            "OPTIONS": {},
+        }
+        if os.getenv("PAPERLESS_DBPORT"):
+            databases["default"]["PORT"] = os.getenv("PAPERLESS_DBPORT")
+
+        if os.getenv("PAPERLESS_DBENGINE") == "mariadb":
+            engine = "django.db.backends.mysql"
+            options = {
+                "read_default_file": "/etc/mysql/my.cnf",
+                "charset": "utf8mb4",
+                "ssl_mode": os.getenv("PAPERLESS_DBSSLMODE", "PREFERRED"),
+                "ssl": {
+                    "ca": os.getenv("PAPERLESS_DBSSLROOTCERT"),
+                    "cert": os.getenv("PAPERLESS_DBSSLCERT"),
+                    "key": os.getenv("PAPERLESS_DBSSLKEY"),
+                },
+            }
+        else:
+            engine = "django.db.backends.postgresql"
+            options = {
+                "sslmode": os.getenv("PAPERLESS_DBSSLMODE", "prefer"),
+                "sslrootcert": os.getenv("PAPERLESS_DBSSLROOTCERT"),
+                "sslcert": os.getenv("PAPERLESS_DBSSLCERT"),
+                "sslkey": os.getenv("PAPERLESS_DBSSLKEY"),
+            }
+
+        databases["default"]["ENGINE"] = engine
+        databases["default"]["OPTIONS"].update(options)
+
+    if os.getenv("PAPERLESS_DB_TIMEOUT") is not None:
+        timeout = int(os.getenv("PAPERLESS_DB_TIMEOUT"))
+        if databases["default"]["ENGINE"] == "django.db.backends.sqlite3":
+            databases["default"]["OPTIONS"].update({"timeout": timeout})
+        else:
+            databases["default"]["OPTIONS"].update({"connect_timeout": timeout})
+            databases["sqlite"]["OPTIONS"].update({"timeout": timeout})
+    return databases
+
+
+DATABASES = _parse_db_settings()
+
+SECRET_KEY = os.getenv("PAPERLESS_SECRET_KEY")
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        "NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator",
+    },
+    {
+        "NAME": "django.contrib.auth.password_validation.MinimumLengthValidator",
+    },
+    {
+        "NAME": "django.contrib.auth.password_validation.CommonPasswordValidator",
+    },
+    {
+        "NAME": "django.contrib.auth.password_validation.NumericPasswordValidator",
+    },
+]
+
+LANGUAGE_CODE = "en-us"
+TIME_ZONE = "UTC"
+USE_I18N = True
+USE_TZ = True
+CSRF_TRUSTED_ORIGINS: list[str] = []
+
+INSTALLED_APPS = [
+    "django.contrib.auth",
+    "django.contrib.contenttypes",
+    "django.contrib.sessions",
+    "django.contrib.messages",
+    "django.contrib.staticfiles",
+    "channels",
+    "allauth",
+    "allauth.account",
+    "allauth.socialaccount",
+    "allauth.mfa",
+    "paperless_migration",
+]
+
+MIDDLEWARE = [
+    "django.middleware.security.SecurityMiddleware",
+    "django.contrib.sessions.middleware.SessionMiddleware",
+    "django.middleware.common.CommonMiddleware",
+    "django.middleware.csrf.CsrfViewMiddleware",
+    "django.contrib.auth.middleware.AuthenticationMiddleware",
+    "django.contrib.messages.middleware.MessageMiddleware",
+    "django.middleware.clickjacking.XFrameOptionsMiddleware",
+    "allauth.account.middleware.AccountMiddleware",
+]
+
+ROOT_URLCONF = "paperless_migration.urls"
+
+TEMPLATES = [
+    {
+        "BACKEND": "django.template.backends.django.DjangoTemplates",
+        "DIRS": [
+            BASE_DIR / "paperless_migration" / "templates",
+            BASE_DIR / "documents" / "templates",
+        ],
+        "APP_DIRS": True,
+        "OPTIONS": {
+            "context_processors": [
+                "django.template.context_processors.request",
+                "django.contrib.auth.context_processors.auth",
+                "django.contrib.messages.context_processors.messages",
+            ],
+        },
+    },
+]
+
+# ASGI application for Channels
+ASGI_APPLICATION = "paperless_migration.asgi.application"
+
+# Channel layers configuration using Redis
+REDIS_URL = _parse_redis_url()
+
+CHANNEL_LAYERS = {
+    "default": {
+        "BACKEND": "channels_redis.core.RedisChannelLayer",
+        "CONFIG": {
+            "hosts": [REDIS_URL],
+            "capacity": 1500,
+            "expiry": 10,
+        },
+    },
+}
+
+# Keep WSGI for compatibility
+WSGI_APPLICATION = "paperless_migration.wsgi.application"
+
+AUTHENTICATION_BACKENDS = [
+    "django.contrib.auth.backends.ModelBackend",
+    "allauth.account.auth_backends.AuthenticationBackend",
+]
+
+STATIC_URL = "/static/"
+STATICFILES_DIRS = [
+    BASE_DIR / ".." / "static",
+    BASE_DIR / "static",
+    BASE_DIR / "documents" / "static",
+]
+
+DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
+
+LOGIN_URL = "/accounts/login/"
+LOGIN_REDIRECT_URL = "/migration/"
+LOGOUT_REDIRECT_URL = "/accounts/login/?loggedout=1"
+
+ACCOUNT_ADAPTER = "allauth.account.adapter.DefaultAccountAdapter"
+ACCOUNT_AUTHENTICATED_LOGIN_REDIRECTS = False
+SOCIALACCOUNT_ADAPTER = "allauth.socialaccount.adapter.DefaultSocialAccountAdapter"
+SOCIALACCOUNT_ENABLED = False
+
+SESSION_ENGINE = "django.contrib.sessions.backends.db"
+
+MIGRATION_EXPORT_PATH = __get_path(
+    "PAPERLESS_MIGRATION_EXPORT_PATH",
+    EXPORT_DIR / "manifest.json",
+)
+MIGRATION_TRANSFORMED_PATH = __get_path(
+    "PAPERLESS_MIGRATION_TRANSFORMED_PATH",
+    EXPORT_DIR / "manifest.v3.json",
+)
+MIGRATION_IMPORTED_PATH = Path(EXPORT_DIR / "import.completed").resolve()
+
+# Progress update frequency (rows between WebSocket updates)
+MIGRATION_PROGRESS_FREQUENCY = int(
+    os.getenv("PAPERLESS_MIGRATION_PROGRESS_FREQUENCY", "100"),
+)
+
+# One-time access code required for migration logins; stable across autoreload
+_code = os.getenv("PAPERLESS_MIGRATION_ACCESS_CODE")
+if not _code:
+    import secrets
+
+    _code = secrets.token_urlsafe(12)
+    os.environ["PAPERLESS_MIGRATION_ACCESS_CODE"] = _code
+MIGRATION_ACCESS_CODE = _code
+if os.environ.get("PAPERLESS_MIGRATION_CODE_LOGGED") != "1":
+    logging.getLogger(__name__).warning(
+        "Migration one-time access code: %s",
+        MIGRATION_ACCESS_CODE,
+    )
+    os.environ["PAPERLESS_MIGRATION_CODE_LOGGED"] = "1"

src/paperless_migration/templates/account/login.html

@@ -0,0 +1,77 @@
+{% load i18n static %}
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+    <meta name="author" content="Paperless-ngx project and contributors">
+    <meta name="robots" content="noindex,nofollow">
+    <meta name="color-scheme" content="light">
+    <title>{% translate "Paperless-ngx sign in" %}</title>
+    <link href="{% static 'bootstrap.min.css' %}" rel="stylesheet">
+    <link href="{% static 'base.css' %}" rel="stylesheet">
+    <style>
+      :root, body, .form-control, .form-floating {
+        color-scheme: light;
+        --bs-body-bg: #f5f5f5;
+        --bs-body-color: #212529;
+        --bs-body-color-rgb: 33, 37, 41;
+        --bs-border-color: #dee2e6;
+        --bs-link-color: #17541f;
+        --bs-link-color-rgb: 23, 84, 31;
+      }
+      @media (prefers-color-scheme: dark) { :root { color-scheme: light; } }
+      body {
+        min-height: 100vh;
+        background:
+          radial-gradient(circle at 20% 20%, #eef5ef, #f7fbf7),
+          linear-gradient(120deg, rgba(23, 84, 31, 0.05) 0%, rgba(0,0,0,0) 30%),
+          linear-gradient(300deg, rgba(15, 54, 20, 0.06) 0%, rgba(0,0,0,0) 40%);
+      }
+    </style>
+  </head>
+  <body class="d-flex align-items-center justify-content-center text-center p-3">
+    <main class="w-100" style="max-width: 360px;">
+      <form class="form-accounts p-4 rounded-4" id="form-account" method="post">
+        {% csrf_token %}
+        {% include "paperless-ngx/snippets/svg_logo.html" with extra_attrs="width='240' class='logo mb-3'" %}
+				<p class="text-uppercase fw-semibold mb-1 text-secondary small" style="letter-spacing: 0.12rem;">{% translate "Migration Mode" %}</p>
+
+        {% for message in messages %}
+          <div class="alert alert-{{ message.level_tag }} mb-2" role="alert">{{ message }}</div>
+        {% endfor %}
+
+        <p class="mb-3">{% translate "Login with a superuser account to proceed." %}</p>
+
+        {% if form.errors %}
+          <div class="alert alert-danger" role="alert">
+            {% for field, errors in form.errors.items %}
+              {% for error in errors %}
+                {{ error }}
+              {% endfor %}
+            {% endfor %}
+          </div>
+        {% endif %}
+
+        {% translate "Username" as i18n_username %}
+        {% translate "Password" as i18n_password %}
+        <div class="form-floating form-stacked-top">
+          <input type="text" name="login" id="inputUsername" placeholder="{{ i18n_username }}" class="form-control" autocorrect="off" autocapitalize="none" required autofocus>
+          <label for="inputUsername">{{ i18n_username }}</label>
+        </div>
+        <div class="form-floating form-stacked-middle">
+          <input type="password" name="password" id="inputPassword" placeholder="{{ i18n_password }}" class="form-control" required>
+          <label for="inputPassword">{{ i18n_password }}</label>
+        </div>
+        <div class="form-floating form-stacked-bottom">
+          <input type="text" name="code" id="inputCode" placeholder="One-time code" class="form-control" required>
+          <label for="inputCode">One-time code</label>
+        </div>
+				<p class="mt-2 small fst-italic">{% translate "Code can be found in the startup logs." %}</p>
+        <div class="d-grid mt-3">
+          <button class="btn btn-lg btn-primary" type="submit">{% translate "Sign in" %}</button>
+        </div>
+      </form>
+    </main>
+  </body>
+</html>

src/paperless_migration/templates/paperless_migration/migration_home.html

@@ -0,0 +1,558 @@
+<!doctype html>
+{% load static %}
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <title>Paperless-ngx Migration Mode</title>
+    <link rel="stylesheet" href="{% static 'bootstrap.min.css' %}" />
+    <link rel="stylesheet" href="{% static 'base.css' %}" />
+    <style>
+      :root, .form-control {
+        color-scheme: light;
+        --bs-body-bg: #f5f5f5;
+        --bs-body-color: #212529;
+        --bs-body-color-rgb: 33, 37, 41;
+        --bs-border-color: #dee2e6;
+        --bs-link-color: var(--pngx-primary);
+        --bs-link-color-rgb: 23, 84, 31;
+      }
+      @media (prefers-color-scheme: dark) { :root { color-scheme: light; } }
+
+      .btn-primary:disabled {
+        --bs-btn-disabled-bg: #4d7352;
+        --bs-btn-disabled-border-color: #4d7352;
+      }
+
+      body {
+        background:
+          radial-gradient(circle at 20% 20%, #eef5ef, #f7fbf7),
+          linear-gradient(120deg, rgba(23, 84, 31, 0.05) 0%, rgba(0,0,0,0) 30%),
+          linear-gradient(300deg, rgba(15, 54, 20, 0.06) 0%, rgba(0,0,0,0) 40%);
+        min-height: 100vh;
+      }
+
+      svg.logo .text {
+        fill: #161616 !important;
+      }
+
+      .hero-card,
+      .card-step {
+        background: #fff;
+        backdrop-filter: blur(6px);
+        border: 1px solid rgba(23, 84, 31, 0.08);
+        box-shadow: 0 16px 40px rgba(0, 0, 0, 0.06);
+        border-radius: 18px;
+      }
+
+      .status-dot {
+        width: 10px;
+        height: 10px;
+        border-radius: 50%;
+        display: inline-block;
+      }
+
+      .card-step {
+        border-radius: 16px;
+        transition: transform 0.15s ease, box-shadow 0.15s ease;
+      }
+
+      .card-step.done-step {
+        opacity: 0.4;
+      }
+
+      .path-pill {
+        background: rgba(23, 84, 31, 0.08);
+        color: var(--bs-body-color);
+        border-radius: 12px;
+        padding: 0.4rem 0.75rem;
+        font-size: 0.9rem;
+      }
+
+      .step-rail {
+        position: relative;
+        height: 4px;
+        background: rgba(23, 84, 31, 0.12);
+        border-radius: 999px;
+      }
+
+      .step-rail .fill {
+        position: absolute;
+        left: 0;
+        top: 0;
+        bottom: 0;
+        width: calc({{ export_exists|yesno:'33,0' }}% + {{ transformed_exists|yesno:'33,0' }}% + {{ imported_exists|yesno:'34,0' }}%);
+        max-width: 100%;
+        background: linear-gradient(90deg, #17541f, #2c7a3c);
+        border-radius: 999px;
+        transition: width 0.3s ease;
+      }
+
+      .step-chip {
+        width: 38px;
+        height: 38px;
+        border-radius: 50%;
+        display: grid;
+        place-items: center;
+        font-weight: 700;
+        background: #fff;
+        border: 2px solid rgba(23, 84, 31, 0.25);
+        color: #17541f;
+        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
+      }
+
+      .step-chip.done {
+        background: #17541f;
+        color: #fff;
+        border-color: #17541f;
+      }
+
+      .console-log {
+        background: #0f1a12;
+        color: #d1e7d6;
+        border-radius: 12px;
+        min-height: 180px;
+        max-height: 400px;
+        padding: 12px;
+        font-size: 0.85rem;
+        font-family: 'Consolas', 'Monaco', monospace;
+        overflow: auto;
+        white-space: pre-wrap;
+        word-break: break-word;
+      }
+
+      .console-log .log-error { color: #ff6b6b; }
+      .console-log .log-warning { color: #ffd93d; }
+      .console-log .log-success { color: #6bcb77; }
+      .console-log .log-info { color: #4d96ff; }
+
+      .progress-bar-container {
+        height: 24px;
+        background: rgba(23, 84, 31, 0.1);
+        border-radius: 12px;
+        overflow: hidden;
+        margin-bottom: 0.5rem;
+      }
+
+      .progress-bar-fill {
+        height: 100%;
+        background: linear-gradient(90deg, #17541f, #2c7a3c);
+        border-radius: 12px;
+        transition: width 0.3s ease;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        color: white;
+        font-size: 0.75rem;
+        font-weight: 600;
+        min-width: fit-content;
+        padding: 0 8px;
+      }
+
+      .stats-grid {
+        display: grid;
+        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
+        gap: 0.5rem;
+        margin-top: 0.5rem;
+      }
+
+      .stat-item {
+        background: rgba(23, 84, 31, 0.05);
+        border-radius: 8px;
+        padding: 0.5rem;
+        text-align: center;
+      }
+
+      .stat-value {
+        font-size: 1.25rem;
+        font-weight: 700;
+        color: #17541f;
+      }
+
+      .stat-label {
+        font-size: 0.75rem;
+        color: #666;
+      }
+
+      .ws-status {
+        display: inline-flex;
+        align-items: center;
+        gap: 0.5rem;
+        padding: 0.25rem 0.75rem;
+        border-radius: 999px;
+        font-size: 0.8rem;
+        font-weight: 500;
+      }
+
+      .ws-status.connected { background: #d4edda; color: #155724; }
+      .ws-status.disconnected { background: #f8d7da; color: #721c24; }
+      .ws-status.connecting { background: #fff3cd; color: #856404; }
+    </style>
+  </head>
+  <body class="pb-4">
+    <div class="container py-4">
+      <div class="row justify-content-center mb-4">
+        <div class="col-lg-9">
+          <div class="hero-card p-4">
+            <div class="d-flex flex-wrap align-items-center justify-content-between gap-3">
+              <div class="d-flex align-items-center gap-3">
+                {% include "paperless-ngx/snippets/svg_logo.html" with extra_attrs="width='280' class='logo'" %}
+                <div class="ps-2">
+                  <p class="text-uppercase fw-semibold mb-1 text-secondary" style="letter-spacing: 0.12rem;">Migration Mode</p>
+                  <h1 class="h3 mb-2 text-primary">Paperless-ngx v2 to v3</h1>
+                  <p class="text-muted mb-0">Migrate your data from Paperless-ngx version 2 to version 3.</p>
+                </div>
+              </div>
+              <div class="text-end">
+                <span class="badge bg-success-subtle text-success border border-success-subtle px-3 py-2">Online</span>
+              </div>
+            </div>
+            <div class="mt-4">
+              <div class="d-flex justify-content-between align-items-center mb-2">
+                <div class="d-flex align-items-center gap-2">
+                  <span class="step-chip {% if export_exists %}done{% endif %}">1</span>
+                  <div>
+                    <div class="fw-semibold mb-0">Export</div>
+                    <small class="text-muted">v2 data</small>
+                  </div>
+                </div>
+                <div class="d-flex align-items-center gap-2">
+                  <span class="step-chip {% if transformed_exists %}done{% endif %}">2</span>
+                  <div>
+                    <div class="fw-semibold mb-0">Transform</div>
+                    <small class="text-muted">to v3 schema</small>
+                  </div>
+                </div>
+                <div class="d-flex align-items-center gap-2">
+                  <span class="step-chip {% if imported_exists %}done{% endif %}">3</span>
+                  <div>
+                    <div class="fw-semibold mb-0">Import</div>
+                    <small class="text-muted">into v3</small>
+                  </div>
+                </div>
+              </div>
+              <div class="step-rail">
+                <div class="fill"></div>
+              </div>
+            </div>
+            {% if messages %}
+              <div class="mt-4">
+                {% for message in messages %}
+                  <div class="alert alert-{{ message.level_tag }} mb-2" role="alert">{{ message }}</div>
+                {% endfor %}
+              </div>
+            {% endif %}
+            <div class="row g-3 mt-2">
+              <div class="col-md-6">
+                <div class="d-flex align-items-center gap-2">
+                  <span class="status-dot bg-{{ export_exists|yesno:'success,danger' }}"></span>
+                  <div>
+                    <div class="fw-semibold">Export file</div>
+                    <div class="small text-muted">{{ export_exists|yesno:"Ready,Missing" }}</div>
+                  </div>
+                </div>
+                <div class="path-pill mt-2 text-truncate" title="{{ export_path }}">{{ export_path }}</div>
+              </div>
+              <div class="col-md-6">
+                <div class="d-flex align-items-center gap-2">
+                  <span class="status-dot bg-{{ transformed_exists|yesno:'success,warning' }}"></span>
+                  <div>
+                    <div class="fw-semibold">Transformed file</div>
+                    <div class="small text-muted">{{ transformed_exists|yesno:"Ready,Pending" }}</div>
+                  </div>
+                </div>
+                <div class="path-pill mt-2 text-truncate" title="{{ transformed_path }}">{{ transformed_path }}</div>
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+
+      <div class="row gy-4 justify-content-center">
+        <div class="col-lg-3 col-md-4">
+          <div class="card card-step h-100 {% if export_exists %}done-step{% endif %}">
+            <div class="card-body d-flex flex-column gap-3">
+              <div>
+                <p class="text-uppercase text-muted mb-1 fw-semibold" style="letter-spacing: 0.08rem;">Step 1</p>
+                <h3 class="h5 mb-1">Export (v2)</h3>
+                <p class="small text-muted mb-0">Generate and upload the v2 export file.</p>
+              </div>
+              <div class="mt-auto d-grid gap-2">
+                <form method="post" enctype="multipart/form-data" class="d-flex gap-2 align-items-center">
+                  {% csrf_token %}
+                  <input class="form-control form-control-sm" type="file" name="export_file" accept=".json" {% if export_exists %}disabled{% endif %} required>
+                  <button class="btn btn-outline-secondary btn-sm" type="submit" name="action" value="upload" {% if export_exists %}disabled aria-disabled="true"{% endif %}>Upload</button>
+                </form>
+                <form method="post">
+                  {% csrf_token %}
+                  <button class="btn btn-primary w-100" type="submit" name="action" value="check" {% if export_exists %}disabled aria-disabled="true"{% endif %}>Re-check export</button>
+                </form>
+              </div>
+            </div>
+          </div>
+        </div>
+
+        <div class="col-lg-3 col-md-4">
+          <div class="card card-step h-100 {% if transformed_exists %}done-step{% endif %}">
+            <div class="card-body d-flex flex-column gap-3">
+              <div>
+                <p class="text-uppercase text-muted mb-1 fw-semibold" style="letter-spacing: 0.08rem;">Step 2</p>
+                <h3 class="h5 mb-1">Transform</h3>
+                <p class="small text-muted mb-0">Convert the export into the v3-ready structure.</p>
+              </div>
+              <div class="mt-auto d-grid gap-2">
+                <form method="post">
+                  {% csrf_token %}
+                  <button
+                    class="btn btn-outline-primary w-100"
+                    type="submit"
+                    name="action"
+                    value="transform"
+                    id="btn-transform"
+                    {% if not export_exists or transformed_exists %}disabled aria-disabled="true"{% endif %}
+                  >
+                    Transform export
+                  </button>
+                </form>
+                {% if transformed_exists %}
+                <form method="post">
+                  {% csrf_token %}
+                  <button class="btn btn-outline-danger btn-sm w-100" type="submit" name="action" value="reset_transform">
+                    Reset transform
+                  </button>
+                </form>
+                {% endif %}
+              </div>
+            </div>
+          </div>
+        </div>
+
+        <div class="col-lg-3 col-md-4">
+          <div class="card card-step h-100 {% if imported_exists %}done-step{% endif %}">
+            <div class="card-body d-flex flex-column gap-3">
+              <div>
+                <p class="text-uppercase text-muted mb-1 fw-semibold" style="letter-spacing: 0.08rem;">Step 3</p>
+                <h3 class="h5 mb-1">Import (v3)</h3>
+                <p class="small text-muted mb-0">Load the transformed data into your v3 instance.</p>
+              </div>
+              <div class="mt-auto">
+                <form method="post">
+                  {% csrf_token %}
+                  <button
+                    class="btn btn-outline-secondary w-100"
+                    type="submit"
+                    name="action"
+                    value="import"
+                    id="btn-import"
+                    {% if not transformed_exists or imported_exists %}disabled aria-disabled="true"{% endif %}
+                  >
+                    Import transformed data
+                  </button>
+                </form>
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+
+      <div class="row justify-content-center mt-4">
+        <div class="col-lg-9">
+          {% if not export_exists %}
+            <div class="alert alert-info mb-3">
+              <div class="fw-semibold mb-1">Export file not found</div>
+              <div class="small">
+                Run the v2 export from your Paperless instance, e.g.:
+                <code>docker run --rm ghcr.io/paperless-ngx/paperless-ngx:2.20.6 document_exporter --data-only</code>
+                (see <a href="https://docs.paperless-ngx.com/administration/#exporter" target="_blank" rel="noopener noreferrer">documentation</a>). Once the <code>manifest.json</code> is in-place, upload it or (especially for larger files) place it directly at the expected location and click "Re-check export".
+                <p class="mt-2 mb-0 text-danger fst-italic">Warning: The export must be generated with version Paperless-ngx v2.20.6</p>
+              </div>
+            </div>
+          {% endif %}
+          <div class="card card-step">
+            <div class="card-body">
+              <div class="d-flex justify-content-between align-items-center mb-2">
+                <div class="fw-semibold">Migration console</div>
+                <span id="ws-status" class="ws-status disconnected">
+                  <span class="status-dot"></span>
+                  <span class="status-text">Ready</span>
+                </span>
+              </div>
+
+              <div id="progress-container" class="mb-3" style="display: none;">
+                <div class="progress-bar-container">
+                  <div id="progress-bar" class="progress-bar-fill" style="width: 0%;">
+                    <span id="progress-text">0 rows</span>
+                  </div>
+                </div>
+                <div id="stats-container" class="stats-grid"></div>
+              </div>
+
+              <div id="migration-log" class="console-log">Ready to begin migration...</div>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+
+    <script>
+      (function() {
+        const logEl = document.getElementById('migration-log');
+        const wsStatusEl = document.getElementById('ws-status');
+        const progressContainer = document.getElementById('progress-container');
+        const progressBar = document.getElementById('progress-bar');
+        const progressText = document.getElementById('progress-text');
+        const statsContainer = document.getElementById('stats-container');
+
+        function setWsStatus(status, text) {
+          wsStatusEl.className = 'ws-status ' + status;
+          wsStatusEl.querySelector('.status-text').textContent = text;
+        }
+
+        function appendLog(message, level) {
+          const line = document.createElement('div');
+          line.className = 'log-' + (level || 'info');
+          line.textContent = message;
+          logEl.appendChild(line);
+          logEl.scrollTop = logEl.scrollHeight;
+        }
+
+        function clearLog() {
+          logEl.innerHTML = '';
+        }
+
+        function updateProgress(current, total, label) {
+          progressContainer.style.display = 'block';
+          const pct = total ? Math.min(100, (current / total) * 100) : 0;
+          progressBar.style.width = (total ? pct : 100) + '%';
+          progressText.textContent = label || (current.toLocaleString() + ' rows');
+        }
+
+        function updateStats(stats) {
+          if (!stats || Object.keys(stats).length === 0) {
+            statsContainer.innerHTML = '';
+            return;
+          }
+
+          let html = '';
+          for (const [key, value] of Object.entries(stats)) {
+            const label = key.replace('documents.', '').replace('_', ' ');
+            html += '<div class="stat-item">' +
+                    '<div class="stat-value">' + (typeof value === 'number' ? value.toLocaleString() : value) + '</div>' +
+                    '<div class="stat-label">' + label + '</div>' +
+                    '</div>';
+          }
+          statsContainer.innerHTML = html;
+        }
+
+        function formatDuration(seconds) {
+          if (seconds < 60) return seconds.toFixed(1) + 's';
+          const mins = Math.floor(seconds / 60);
+          const secs = (seconds % 60).toFixed(0);
+          return mins + 'm ' + secs + 's';
+        }
+
+        function startWebSocket(action) {
+          const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
+          const wsUrl = protocol + '//' + window.location.host + '/ws/migration/' + action + '/';
+
+          clearLog();
+          appendLog('Connecting to ' + action + ' service...', 'info');
+          setWsStatus('connecting', 'Connecting...');
+          progressContainer.style.display = 'none';
+          statsContainer.innerHTML = '';
+
+          const ws = new WebSocket(wsUrl);
+
+          ws.onopen = function() {
+            setWsStatus('connected', 'Connected');
+            appendLog('Connected. Starting ' + action + '...', 'success');
+            ws.send(JSON.stringify({ action: 'start' }));
+          };
+
+          ws.onmessage = function(event) {
+            try {
+              const data = JSON.parse(event.data);
+
+              switch (data.type) {
+                case 'log':
+                  appendLog(data.message, data.level || 'info');
+                  break;
+
+                case 'progress':
+                  updateProgress(data.current, data.total, data.label);
+                  break;
+
+                case 'stats':
+                  if (data.transformed) {
+                    updateStats(data.transformed);
+                  } else {
+                    updateStats(data);
+                  }
+                  break;
+
+                case 'complete':
+                  const status = data.success ? 'success' : 'error';
+                  const msg = data.success
+                    ? 'Completed successfully in ' + formatDuration(data.duration)
+                    : 'Operation failed';
+                  appendLog(msg, status);
+
+                  if (data.total_processed) {
+                    appendLog('Total processed: ' + data.total_processed.toLocaleString() + ' rows', 'info');
+                  }
+                  if (data.speed) {
+                    appendLog('Speed: ' + Math.round(data.speed).toLocaleString() + ' rows/sec', 'info');
+                  }
+                  if (data.stats) {
+                    updateStats(data.stats);
+                  }
+
+                  setWsStatus('disconnected', 'Complete');
+                  ws.close();
+
+                  if (data.success) {
+                    setTimeout(function() { window.location.reload(); }, 1500);
+                  }
+                  break;
+
+                case 'error':
+                  appendLog('Error: ' + data.message, 'error');
+                  setWsStatus('disconnected', 'Error');
+                  break;
+
+                default:
+                  appendLog(JSON.stringify(data), 'info');
+              }
+            } catch (e) {
+              appendLog('Received: ' + event.data, 'info');
+            }
+          };
+
+          ws.onerror = function(error) {
+            appendLog('WebSocket error occurred', 'error');
+            setWsStatus('disconnected', 'Error');
+          };
+
+          ws.onclose = function(event) {
+            if (event.code !== 1000) {
+              const reason = event.code === 4001 ? 'Not authenticated'
+                           : event.code === 4002 ? 'Migration code not verified'
+                           : event.code === 4003 ? 'Superuser access required'
+                           : 'Connection closed (code: ' + event.code + ')';
+              appendLog(reason, 'error');
+            }
+            setWsStatus('disconnected', 'Disconnected');
+          };
+        }
+
+        // Check if we should auto-start a WebSocket action
+        {% if ws_action %}
+        startWebSocket('{{ ws_action }}');
+        {% endif %}
+
+        // Expose for manual triggering if needed
+        window.startMigrationWs = startWebSocket;
+      })();
+    </script>
+  </body>
+</html>

src/paperless_migration/urls.py

@@ -0,0 +1,21 @@
+"""URL configuration for migration mode."""
+
+from __future__ import annotations
+
+from django.conf import settings
+from django.contrib.staticfiles.urls import staticfiles_urlpatterns
+from django.urls import include
+from django.urls import path
+
+from paperless_migration import views
+
+urlpatterns = [
+    path("accounts/login/", views.migration_login, name="account_login"),
+    path("accounts/", include("allauth.urls")),
+    path("migration/", views.migration_home, name="migration_home"),
+    # Redirect root to migration home
+    path("", views.migration_home, name="home"),
+]
+
+if settings.DEBUG:
+    urlpatterns += staticfiles_urlpatterns()

src/paperless_migration/views.py

@@ -0,0 +1,132 @@
+"""Views for migration mode web interface."""
+
+from __future__ import annotations
+
+from pathlib import Path
+from typing import TYPE_CHECKING
+
+from django.conf import settings
+from django.contrib import messages
+from django.contrib.auth import authenticate
+from django.contrib.auth import login
+from django.contrib.auth.decorators import login_required
+from django.http import HttpResponseForbidden
+from django.shortcuts import redirect
+from django.shortcuts import render
+from django.views.decorators.http import require_http_methods
+
+if TYPE_CHECKING:
+    from django.http import HttpRequest
+    from django.http import HttpResponse
+
+
+def _check_migration_access(request: HttpRequest) -> HttpResponse | None:
+    """Check if user has migration access. Returns error response or None."""
+    if not request.session.get("migration_code_ok"):
+        return HttpResponseForbidden("Access code required")
+    if not request.user.is_superuser:
+        return HttpResponseForbidden("Superuser access required")
+    return None
+
+
+@login_required
+@require_http_methods(["GET", "POST"])
+def migration_home(request: HttpRequest) -> HttpResponse:
+    """Main migration dashboard view."""
+    error_response = _check_migration_access(request)
+    if error_response:
+        return error_response
+
+    export_path = Path(settings.MIGRATION_EXPORT_PATH)
+    transformed_path = Path(settings.MIGRATION_TRANSFORMED_PATH)
+    imported_marker = Path(settings.MIGRATION_IMPORTED_PATH)
+
+    if request.method == "POST":
+        action = request.POST.get("action")
+
+        if action == "check":
+            messages.success(request, "Checked export paths.")
+
+        elif action == "upload":
+            upload = request.FILES.get("export_file")
+            if not upload:
+                messages.error(request, "No file selected.")
+            else:
+                try:
+                    export_path.parent.mkdir(parents=True, exist_ok=True)
+                    with export_path.open("wb") as dest:
+                        for chunk in upload.chunks():
+                            dest.write(chunk)
+                    messages.success(request, f"Uploaded to {export_path}.")
+                except Exception as exc:
+                    messages.error(request, f"Failed to save file: {exc}")
+
+        elif action == "transform":
+            if imported_marker.exists():
+                imported_marker.unlink()
+            # Signal to start WebSocket connection for transform
+            request.session["start_ws_action"] = "transform"
+            messages.info(request, "Starting transform via WebSocket...")
+
+        elif action == "import":
+            # Signal to start WebSocket connection for import
+            request.session["start_ws_action"] = "import"
+            messages.info(request, "Starting import via WebSocket...")
+
+        elif action == "reset_transform":
+            if transformed_path.exists():
+                try:
+                    transformed_path.unlink()
+                    messages.success(request, "Transformed file deleted.")
+                except Exception as exc:
+                    messages.error(request, f"Failed to delete transformed file: {exc}")
+            if imported_marker.exists():
+                try:
+                    imported_marker.unlink()
+                except Exception:
+                    pass
+
+        else:
+            messages.error(request, "Unknown action.")
+
+        return redirect("migration_home")
+
+    ws_action = request.session.pop("start_ws_action", None)
+
+    context = {
+        "export_path": export_path,
+        "export_exists": export_path.exists(),
+        "transformed_path": transformed_path,
+        "transformed_exists": transformed_path.exists(),
+        "imported_exists": imported_marker.exists(),
+        "ws_action": ws_action,
+    }
+    return render(request, "paperless_migration/migration_home.html", context)
+
+
+@require_http_methods(["GET", "POST"])
+def migration_login(request: HttpRequest) -> HttpResponse:
+    """Migration-specific login view requiring access code."""
+    if request.method == "POST":
+        username = request.POST.get("login", "")
+        password = request.POST.get("password", "")
+        code = request.POST.get("code", "")
+
+        if not code or code != settings.MIGRATION_ACCESS_CODE:
+            messages.error(request, "One-time code is required.")
+            return redirect("account_login")
+
+        user = authenticate(request, username=username, password=password)
+        if user is None:
+            messages.error(request, "Invalid username or password.")
+            return redirect("account_login")
+
+        if not user.is_superuser:
+            messages.error(request, "Superuser access required.")
+            return redirect("account_login")
+
+        login(request, user)
+        request.session["migration_code_ok"] = True
+        return redirect(settings.LOGIN_REDIRECT_URL)
+
+    return render(request, "account/login.html")

src/paperless_migration/wsgi.py

@@ -0,0 +1,7 @@
+import os
+
+from django.core.wsgi import get_wsgi_application
+
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "paperless_migration.settings")
+
+application = get_wsgi_application()

uv.lock

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 version = "1.3.1"
 source = { registry = "https://pypi.org/simple" }
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+    { name = "typing-extensions", marker = "(python_full_version < '3.11' and sys_platform == 'darwin') or (python_full_version < '3.11' and sys_platform == 'linux')" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/50/79/66800aadf48771f6b62f7eb014e352e5d06856655206165d775e675a02c9/exceptiongroup-1.3.1.tar.gz", hash = "sha256:8b412432c6055b0b7d14c310000ae93352ed6754f70fa8f7c34141f91c4e3219", size = 30371, upload-time = "2025-11-21T23:01:54.787Z" }
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