diff --git a/invokeai/app/api_app.py b/invokeai/app/api_app.py
index ceaeb95147a..2efd338c1ec 100644
--- a/invokeai/app/api_app.py
+++ b/invokeai/app/api_app.py
@@ -26,7 +26,7 @@
 import invokeai.frontend.web as web_dir
 from invokeai.app.api.no_cache_staticfiles import NoCacheStaticFiles
 from invokeai.app.invocations.model import ModelIdentifierField
-from invokeai.app.services.config.config_default import get_config
+from invokeai.app.services.config import get_config
 from invokeai.app.services.session_processor.session_processor_common import ProgressImage
 from invokeai.backend.util.devices import TorchDevice
 
diff --git a/invokeai/app/invocations/__init__.py b/invokeai/app/invocations/__init__.py
index cb1caa167ef..f9b0932b04d 100644
--- a/invokeai/app/invocations/__init__.py
+++ b/invokeai/app/invocations/__init__.py
@@ -3,7 +3,7 @@
 from importlib.util import module_from_spec, spec_from_file_location
 from pathlib import Path
 
-from invokeai.app.services.config.config_default import get_config
+from invokeai.app.services.config import get_config
 
 custom_nodes_path = Path(get_config().custom_nodes_path)
 custom_nodes_path.mkdir(parents=True, exist_ok=True)
diff --git a/invokeai/app/invocations/baseinvocation.py b/invokeai/app/invocations/baseinvocation.py
index 40c7b41caeb..ee4b88fa2e0 100644
--- a/invokeai/app/invocations/baseinvocation.py
+++ b/invokeai/app/invocations/baseinvocation.py
@@ -33,7 +33,7 @@
     FieldKind,
     Input,
 )
-from invokeai.app.services.config.config_default import get_config
+from invokeai.app.services.config import get_config
 from invokeai.app.services.shared.invocation_context import InvocationContext
 from invokeai.app.util.metaenum import MetaEnum
 from invokeai.app.util.misc import uuid_string
diff --git a/invokeai/app/services/config/__init__.py b/invokeai/app/services/config/__init__.py
index 126692f08a8..ac154386dae 100644
--- a/invokeai/app/services/config/__init__.py
+++ b/invokeai/app/services/config/__init__.py
@@ -2,6 +2,7 @@
 
 from invokeai.app.services.config.config_common import PagingArgumentParser
 
-from .config_default import InvokeAIAppConfig, get_config
+from .config_default import InvokeAIAppConfig
+from .config_migrate import get_config
 
 __all__ = ["InvokeAIAppConfig", "get_config", "PagingArgumentParser"]
diff --git a/invokeai/app/services/config/config_common.py b/invokeai/app/services/config/config_common.py
index 0765b93f2cf..b1b910226d7 100644
--- a/invokeai/app/services/config/config_common.py
+++ b/invokeai/app/services/config/config_common.py
@@ -12,6 +12,10 @@
 
 import argparse
 import pydoc
+from dataclasses import dataclass
+from typing import Any, Callable, TypeAlias
+
+from packaging.version import Version
 
 
 class PagingArgumentParser(argparse.ArgumentParser):
@@ -23,3 +27,21 @@ class PagingArgumentParser(argparse.ArgumentParser):
     def print_help(self, file=None) -> None:
         text = self.format_help()
         pydoc.pager(text)
+
+
+AppConfigDict: TypeAlias = dict[str, Any]
+
+ConfigMigrationFunction: TypeAlias = Callable[[AppConfigDict], AppConfigDict]
+
+
+@dataclass
+class ConfigMigration:
+    """Defines an individual config migration."""
+
+    from_version: Version
+    to_version: Version
+    function: ConfigMigrationFunction
+
+    def __hash__(self) -> int:
+        # Callables are not hashable, so we need to implement our own __hash__ function to use this class in a set.
+        return hash((self.from_version, self.to_version))
diff --git a/invokeai/app/services/config/config_default.py b/invokeai/app/services/config/config_default.py
index 54a092d03e7..06d0ea27831 100644
--- a/invokeai/app/services/config/config_default.py
+++ b/invokeai/app/services/config/config_default.py
@@ -3,11 +3,8 @@
 
 from __future__ import annotations
 
-import locale
 import os
 import re
-import shutil
-from functools import lru_cache
 from pathlib import Path
 from typing import Any, Literal, Optional
 
@@ -16,9 +13,7 @@
 from pydantic import BaseModel, Field, PrivateAttr, field_validator
 from pydantic_settings import BaseSettings, PydanticBaseSettingsSource, SettingsConfigDict
 
-import invokeai.configs as model_configs
 from invokeai.backend.model_hash.model_hash import HASHING_ALGORITHMS
-from invokeai.frontend.cli.arg_parser import InvokeAIArgs
 
 INIT_FILE = Path("invokeai.yaml")
 DB_FILE = Path("invokeai.db")
@@ -346,169 +341,3 @@ def settings_customise_sources(
         file_secret_settings: PydanticBaseSettingsSource,
     ) -> tuple[PydanticBaseSettingsSource, ...]:
         return (init_settings,)
-
-
-def migrate_v3_config_dict(config_dict: dict[str, Any]) -> InvokeAIAppConfig:
-    """Migrate a v3 config dictionary to a current config object.
-
-    Args:
-        config_dict: A dictionary of settings from a v3 config file.
-
-    Returns:
-        An instance of `InvokeAIAppConfig` with the migrated settings.
-
-    """
-    parsed_config_dict: dict[str, Any] = {}
-    for _category_name, category_dict in config_dict["InvokeAI"].items():
-        for k, v in category_dict.items():
-            # `outdir` was renamed to `outputs_dir` in v4
-            if k == "outdir":
-                parsed_config_dict["outputs_dir"] = v
-            # `max_cache_size` was renamed to `ram` some time in v3, but both names were used
-            if k == "max_cache_size" and "ram" not in category_dict:
-                parsed_config_dict["ram"] = v
-            # `max_vram_cache_size` was renamed to `vram` some time in v3, but both names were used
-            if k == "max_vram_cache_size" and "vram" not in category_dict:
-                parsed_config_dict["vram"] = v
-            # autocast was removed in v4.0.1
-            if k == "precision" and v == "autocast":
-                parsed_config_dict["precision"] = "auto"
-            if k == "conf_path":
-                parsed_config_dict["legacy_models_yaml_path"] = v
-            if k == "legacy_conf_dir":
-                # The old default for this was "configs/stable-diffusion" ("configs\stable-diffusion" on Windows).
-                if v == "configs/stable-diffusion" or v == "configs\\stable-diffusion":
-                    # If if the incoming config has the default value, skip
-                    continue
-                elif Path(v).name == "stable-diffusion":
-                    # Else if the path ends in "stable-diffusion", we assume the parent is the new correct path.
-                    parsed_config_dict["legacy_conf_dir"] = str(Path(v).parent)
-                else:
-                    # Else we do not attempt to migrate this setting
-                    parsed_config_dict["legacy_conf_dir"] = v
-            elif k in InvokeAIAppConfig.model_fields:
-                # skip unknown fields
-                parsed_config_dict[k] = v
-    # When migrating the config file, we should not include currently-set environment variables.
-    config = DefaultInvokeAIAppConfig.model_validate(parsed_config_dict)
-
-    return config
-
-
-def migrate_v4_0_0_config_dict(config_dict: dict[str, Any]) -> InvokeAIAppConfig:
-    """Migrate v4.0.0 config dictionary to a current config object.
-
-    Args:
-        config_dict: A dictionary of settings from a v4.0.0 config file.
-
-    Returns:
-        An instance of `InvokeAIAppConfig` with the migrated settings.
-    """
-    parsed_config_dict: dict[str, Any] = {}
-    for k, v in config_dict.items():
-        # autocast was removed from precision in v4.0.1
-        if k == "precision" and v == "autocast":
-            parsed_config_dict["precision"] = "auto"
-        else:
-            parsed_config_dict[k] = v
-        if k == "schema_version":
-            parsed_config_dict[k] = CONFIG_SCHEMA_VERSION
-    config = DefaultInvokeAIAppConfig.model_validate(parsed_config_dict)
-    return config
-
-
-def load_and_migrate_config(config_path: Path) -> InvokeAIAppConfig:
-    """Load and migrate a config file to the latest version.
-
-    Args:
-        config_path: Path to the config file.
-
-    Returns:
-        An instance of `InvokeAIAppConfig` with the loaded and migrated settings.
-    """
-    assert config_path.suffix == ".yaml"
-    with open(config_path, "rt", encoding=locale.getpreferredencoding()) as file:
-        loaded_config_dict = yaml.safe_load(file)
-
-    assert isinstance(loaded_config_dict, dict)
-
-    if "InvokeAI" in loaded_config_dict:
-        # This is a v3 config file, attempt to migrate it
-        shutil.copy(config_path, config_path.with_suffix(".yaml.bak"))
-        try:
-            # loaded_config_dict could be the wrong shape, but we will catch all exceptions below
-            migrated_config = migrate_v3_config_dict(loaded_config_dict)  # pyright: ignore [reportUnknownArgumentType]
-        except Exception as e:
-            shutil.copy(config_path.with_suffix(".yaml.bak"), config_path)
-            raise RuntimeError(f"Failed to load and migrate v3 config file {config_path}: {e}") from e
-        migrated_config.write_file(config_path)
-        return migrated_config
-
-    if loaded_config_dict["schema_version"] == "4.0.0":
-        loaded_config_dict = migrate_v4_0_0_config_dict(loaded_config_dict)
-        loaded_config_dict.write_file(config_path)
-
-    # Attempt to load as a v4 config file
-    try:
-        # Meta is not included in the model fields, so we need to validate it separately
-        config = InvokeAIAppConfig.model_validate(loaded_config_dict)
-        assert (
-            config.schema_version == CONFIG_SCHEMA_VERSION
-        ), f"Invalid schema version, expected {CONFIG_SCHEMA_VERSION}: {config.schema_version}"
-        return config
-    except Exception as e:
-        raise RuntimeError(f"Failed to load config file {config_path}: {e}") from e
-
-
-@lru_cache(maxsize=1)
-def get_config() -> InvokeAIAppConfig:
-    """Get the global singleton app config.
-
-    When first called, this function:
-    - Creates a config object. `pydantic-settings` handles merging of settings from environment variables, but not the init file.
-    - Retrieves any provided CLI args from the InvokeAIArgs class. It does not _parse_ the CLI args; that is done in the main entrypoint.
-    - Sets the root dir, if provided via CLI args.
-    - Logs in to HF if there is no valid token already.
-    - Copies all legacy configs to the legacy conf dir (needed for conversion from ckpt to diffusers).
-    - Reads and merges in settings from the config file if it exists, else writes out a default config file.
-
-    On subsequent calls, the object is returned from the cache.
-    """
-    # This object includes environment variables, as parsed by pydantic-settings
-    config = InvokeAIAppConfig()
-
-    args = InvokeAIArgs.args
-
-    # This flag serves as a proxy for whether the config was retrieved in the context of the full application or not.
-    # If it is False, we should just return a default config and not set the root, log in to HF, etc.
-    if not InvokeAIArgs.did_parse:
-        return config
-
-    # Set CLI args
-    if root := getattr(args, "root", None):
-        config._root = Path(root)
-    if config_file := getattr(args, "config_file", None):
-        config._config_file = Path(config_file)
-
-    # Create the example config file, with some extra example values provided
-    example_config = DefaultInvokeAIAppConfig()
-    example_config.remote_api_tokens = [
-        URLRegexTokenPair(url_regex="cool-models.com", token="my_secret_token"),
-        URLRegexTokenPair(url_regex="nifty-models.com", token="some_other_token"),
-    ]
-    example_config.write_file(config.config_file_path.with_suffix(".example.yaml"), as_example=True)
-
-    # Copy all legacy configs - We know `__path__[0]` is correct here
-    configs_src = Path(model_configs.__path__[0])  # pyright: ignore [reportUnknownMemberType, reportUnknownArgumentType, reportAttributeAccessIssue]
-    shutil.copytree(configs_src, config.legacy_conf_path, dirs_exist_ok=True)
-
-    if config.config_file_path.exists():
-        config_from_file = load_and_migrate_config(config.config_file_path)
-        # Clobbering here will overwrite any settings that were set via environment variables
-        config.update_config(config_from_file, clobber=False)
-    else:
-        # We should never write env vars to the config file
-        default_config = DefaultInvokeAIAppConfig()
-        default_config.write_file(config.config_file_path, as_example=False)
-
-    return config
diff --git a/invokeai/app/services/config/config_migrate.py b/invokeai/app/services/config/config_migrate.py
new file mode 100644
index 00000000000..4884802e8c8
--- /dev/null
+++ b/invokeai/app/services/config/config_migrate.py
@@ -0,0 +1,177 @@
+# Copyright 2024 Lincoln D. Stein and the InvokeAI Development Team
+
+"""
+Utility class for migrating among versions of the InvokeAI app config schema.
+"""
+
+import locale
+import shutil
+from copy import deepcopy
+from functools import lru_cache
+from pathlib import Path
+from tempfile import TemporaryDirectory
+from typing import Iterable
+
+import yaml
+from packaging.version import Version
+
+import invokeai.configs as model_configs
+from invokeai.app.services.config.config_common import AppConfigDict, ConfigMigration
+from invokeai.app.services.config.migrations import config_migration_1, config_migration_2
+from invokeai.frontend.cli.arg_parser import InvokeAIArgs
+
+from .config_default import CONFIG_SCHEMA_VERSION, DefaultInvokeAIAppConfig, InvokeAIAppConfig, URLRegexTokenPair
+
+
+class ConfigMigrator:
+    """This class allows migrators to register their input and output versions."""
+
+    def __init__(self) -> None:
+        self._migrations: set[ConfigMigration] = set()
+
+    def register(self, migration: ConfigMigration) -> None:
+        migration_from_already_registered = any(m.from_version == migration.from_version for m in self._migrations)
+        migration_to_already_registered = any(m.to_version == migration.to_version for m in self._migrations)
+        if migration_from_already_registered or migration_to_already_registered:
+            raise ValueError(
+                f"A migration from {migration.from_version} or to {migration.to_version} has already been registered."
+            )
+        self._migrations.add(migration)
+
+    @staticmethod
+    def _check_for_discontinuities(migrations: Iterable[ConfigMigration]) -> None:
+        current_version = Version("3.0.0")
+        sorted_migrations = sorted(migrations, key=lambda x: x.from_version)
+        for m in sorted_migrations:
+            if current_version != m.from_version:
+                raise ValueError(
+                    f"Migration functions are not continuous. Expected from_version={current_version} but got from_version={m.from_version}, for migration function {m.function.__name__}"
+                )
+            current_version = m.to_version
+
+    def run_migrations(self, original_config: AppConfigDict) -> AppConfigDict:
+        """
+        Use the registered migrations to bring config up to latest version.
+
+        Args:
+            original_config: The original configuration.
+
+        Returns:
+            The new configuration, lifted up to the latest version.
+        """
+
+        # Sort migrations by version number and raise a ValueError if any version range overlaps are detected.
+        sorted_migrations = sorted(self._migrations, key=lambda x: x.from_version)
+        self._check_for_discontinuities(sorted_migrations)
+
+        # Do not mutate the incoming dict - we don't know who else may be using it
+        migrated_config = deepcopy(original_config)
+
+        # v3.0.0 configs did not have "schema_version", but did have "InvokeAI"
+        if "InvokeAI" in migrated_config:
+            version = Version("3.0.0")
+        else:
+            version = Version(migrated_config["schema_version"])
+
+        for migration in sorted_migrations:
+            if version == migration.from_version:
+                migrated_config = migration.function(migrated_config)
+                version = migration.to_version
+
+        # We must end on the latest version
+        assert migrated_config["schema_version"] == str(sorted_migrations[-1].to_version)
+        return migrated_config
+
+
+def load_and_migrate_config(config_path: Path) -> InvokeAIAppConfig:
+    """Load and migrate a config file to the latest version.
+
+    Args:
+        config_path: Path to the config file.
+
+    Returns:
+        An instance of `InvokeAIAppConfig` with the loaded and migrated settings.
+    """
+    assert config_path.suffix == ".yaml"
+    with open(config_path, "rt", encoding=locale.getpreferredencoding()) as file:
+        loaded_config_dict: AppConfigDict = yaml.safe_load(file)
+
+    assert isinstance(loaded_config_dict, dict)
+
+    shutil.copy(config_path, config_path.with_suffix(".yaml.bak"))
+    try:
+        migrator = ConfigMigrator()
+        migrator.register(config_migration_1)
+        migrator.register(config_migration_2)
+        migrated_config_dict = migrator.run_migrations(loaded_config_dict)
+    except Exception as e:
+        shutil.copy(config_path.with_suffix(".yaml.bak"), config_path)
+        raise RuntimeError(f"Failed to load and migrate config file {config_path}: {e}") from e
+
+    # Attempt to load as a v4 config file
+    try:
+        config = InvokeAIAppConfig.model_validate(migrated_config_dict)
+        assert (
+            config.schema_version == CONFIG_SCHEMA_VERSION
+        ), f"Invalid schema version, expected {CONFIG_SCHEMA_VERSION} but got {config.schema_version}"
+        return config
+    except Exception as e:
+        raise RuntimeError(f"Failed to load config file {config_path}: {e}") from e
+
+
+# TODO(psyche): This must must be in this file to avoid circular dependencies
+@lru_cache(maxsize=1)
+def get_config() -> InvokeAIAppConfig:
+    """Get the global singleton app config.
+
+    When first called, this function:
+    - Creates a config object. `pydantic-settings` handles merging of settings from environment variables, but not the init file.
+    - Retrieves any provided CLI args from the InvokeAIArgs class. It does not _parse_ the CLI args; that is done in the main entrypoint.
+    - Sets the root dir, if provided via CLI args.
+    - Logs in to HF if there is no valid token already.
+    - Copies all legacy configs to the legacy conf dir (needed for conversion from ckpt to diffusers).
+    - Reads and merges in settings from the config file if it exists, else writes out a default config file.
+
+    On subsequent calls, the object is returned from the cache.
+    """
+    # This object includes environment variables, as parsed by pydantic-settings
+    config = InvokeAIAppConfig()
+
+    args = InvokeAIArgs.args
+
+    # This flag serves as a proxy for whether the config was retrieved in the context of the full application or not.
+    # If it is False, we should just return a default config and not set the root, log in to HF, etc.
+    if not InvokeAIArgs.did_parse:
+        tmpdir = TemporaryDirectory()
+        config._root = Path(tmpdir.name)
+        return config
+
+    # Set CLI args
+    if root := getattr(args, "root", None):
+        config._root = Path(root)
+    if config_file := getattr(args, "config_file", None):
+        config._config_file = Path(config_file)
+
+    # Create the example config file, with some extra example values provided
+    example_config = DefaultInvokeAIAppConfig()
+    example_config.remote_api_tokens = [
+        URLRegexTokenPair(url_regex="cool-models.com", token="my_secret_token"),
+        URLRegexTokenPair(url_regex="nifty-models.com", token="some_other_token"),
+    ]
+    example_config.write_file(config.config_file_path.with_suffix(".example.yaml"), as_example=True)
+
+    # Copy all legacy configs - We know `__path__[0]` is correct here
+    configs_src = Path(model_configs.__path__[0])  # pyright: ignore [reportUnknownMemberType, reportUnknownArgumentType, reportAttributeAccessIssue]
+    shutil.copytree(configs_src, config.legacy_conf_path, dirs_exist_ok=True)
+
+    if config.config_file_path.exists():
+        config_from_file = load_and_migrate_config(config.config_file_path)
+        config_from_file.write_file(config.config_file_path)
+        # Clobbering here will overwrite any settings that were set via environment variables
+        config.update_config(config_from_file, clobber=False)
+    else:
+        # We should never write env vars to the config file
+        default_config = DefaultInvokeAIAppConfig()
+        default_config.write_file(config.config_file_path, as_example=False)
+
+    return config
diff --git a/invokeai/app/services/config/migrations.py b/invokeai/app/services/config/migrations.py
new file mode 100644
index 00000000000..c2512efbcf8
--- /dev/null
+++ b/invokeai/app/services/config/migrations.py
@@ -0,0 +1,102 @@
+# Copyright 2024 Lincoln D. Stein and the InvokeAI Development Team
+
+"""
+Schema migrations to perform on an InvokeAIAppConfig object.
+
+The Migrations class defined in this module defines a series of
+schema version migration steps for the InvokeAIConfig object.
+
+To define a new migration, add a migration function to
+Migrations.load_migrations() following the existing examples.
+"""
+
+from pathlib import Path
+
+from packaging.version import Version
+
+from invokeai.app.services.config.config_common import AppConfigDict, ConfigMigration
+
+from .config_default import InvokeAIAppConfig
+
+
+def migrate_v300_to_v400(original_config: AppConfigDict) -> AppConfigDict:
+    """Migrate a v3.0.0 config dict to v4.0.0.
+
+    Changes in this migration:
+    - `outdir` was renamed to `outputs_dir`
+    - `max_cache_size` was renamed to `ram`
+    - `max_vram_cache_size` was renamed to `vram`
+    - `conf_path`, which pointed to the old `models.yaml`, was removed - but if need to stash it to migrate the entries
+        to the database
+    - `legacy_conf_dir` was changed from a path relative to the app root, to a path relative to $INVOKEAI_ROOT/configs
+
+    Args:
+        config_dict: The v3.0.0 config dict to migrate.
+
+    Returns:
+        The migrated v4.0.0 config dict.
+    """
+    migrated_config: AppConfigDict = {}
+    for _category_name, category_dict in original_config["InvokeAI"].items():
+        for k, v in category_dict.items():
+            # `outdir` was renamed to `outputs_dir` in v4
+            if k == "outdir":
+                migrated_config["outputs_dir"] = v
+            # `max_cache_size` was renamed to `ram` some time in v3, but both names were used
+            if k == "max_cache_size" and "ram" not in category_dict:
+                migrated_config["ram"] = v
+            # `max_vram_cache_size` was renamed to `vram` some time in v3, but both names were used
+            if k == "max_vram_cache_size" and "vram" not in category_dict:
+                migrated_config["vram"] = v
+            if k == "conf_path":
+                migrated_config["legacy_models_yaml_path"] = v
+            if k == "legacy_conf_dir":
+                # The old default for this was "configs/stable-diffusion" ("configs\stable-diffusion" on Windows).
+                if v == "configs/stable-diffusion" or v == "configs\\stable-diffusion":
+                    # If if the incoming config has the default value, skip
+                    continue
+                elif Path(v).name == "stable-diffusion":
+                    # Else if the path ends in "stable-diffusion", we assume the parent is the new correct path.
+                    migrated_config["legacy_conf_dir"] = str(Path(v).parent)
+                else:
+                    # Else we do not attempt to migrate this setting
+                    migrated_config["legacy_conf_dir"] = v
+            elif k in InvokeAIAppConfig.model_fields:
+                # skip unknown fields
+                migrated_config[k] = v
+    migrated_config["schema_version"] = "4.0.0"
+    return migrated_config
+
+
+config_migration_1 = ConfigMigration(
+    from_version=Version("3.0.0"), to_version=Version("4.0.0"), function=migrate_v300_to_v400
+)
+
+
+def migrate_v400_to_v401(original_config: AppConfigDict) -> AppConfigDict:
+    """Migrate a v4.0.0 config dict to v4.0.1.
+
+    Changes in this migration:
+    - `precision: "autocast"` was removed, fall back to "auto"
+
+    Args:
+        config_dict: The v4.0.0 config dict to migrate.
+
+    Returns:
+        The migrated v4.0.1 config dict.
+    """
+    migrated_config: AppConfigDict = {}
+    for k, v in original_config.items():
+        # autocast was removed from precision in v4.0.1
+        if k == "precision" and v == "autocast":
+            migrated_config["precision"] = "auto"
+        # skip unknown fields
+        elif k in InvokeAIAppConfig.model_fields:
+            migrated_config[k] = v
+    migrated_config["schema_version"] = "4.0.1"
+    return migrated_config
+
+
+config_migration_2 = ConfigMigration(
+    from_version=Version("4.0.0"), to_version=Version("4.0.1"), function=migrate_v400_to_v401
+)
diff --git a/invokeai/app/services/shared/invocation_context.py b/invokeai/app/services/shared/invocation_context.py
index 9994d663e5e..68f7b11bcda 100644
--- a/invokeai/app/services/shared/invocation_context.py
+++ b/invokeai/app/services/shared/invocation_context.py
@@ -9,7 +9,7 @@
 from invokeai.app.invocations.constants import IMAGE_MODES
 from invokeai.app.invocations.fields import MetadataField, WithBoard, WithMetadata
 from invokeai.app.services.boards.boards_common import BoardDTO
-from invokeai.app.services.config.config_default import InvokeAIAppConfig
+from invokeai.app.services.config import InvokeAIAppConfig
 from invokeai.app.services.image_records.image_records_common import ImageCategory, ResourceOrigin
 from invokeai.app.services.images.images_common import ImageDTO
 from invokeai.app.services.invocation_services import InvocationServices
diff --git a/invokeai/app/services/shared/sqlite/sqlite_util.py b/invokeai/app/services/shared/sqlite/sqlite_util.py
index 1eed0b44092..2dcaaa8aedd 100644
--- a/invokeai/app/services/shared/sqlite/sqlite_util.py
+++ b/invokeai/app/services/shared/sqlite/sqlite_util.py
@@ -1,6 +1,6 @@
 from logging import Logger
 
-from invokeai.app.services.config.config_default import InvokeAIAppConfig
+from invokeai.app.services.config import InvokeAIAppConfig
 from invokeai.app.services.image_files.image_files_base import ImageFileStorageBase
 from invokeai.app.services.shared.sqlite.sqlite_database import SqliteDatabase
 from invokeai.app.services.shared.sqlite_migrator.migrations.migration_1 import build_migration_1
diff --git a/invokeai/app/services/shared/sqlite_migrator/migrations/migration_8.py b/invokeai/app/services/shared/sqlite_migrator/migrations/migration_8.py
index 154a5236cae..4fb8cf46ef4 100644
--- a/invokeai/app/services/shared/sqlite_migrator/migrations/migration_8.py
+++ b/invokeai/app/services/shared/sqlite_migrator/migrations/migration_8.py
@@ -1,7 +1,7 @@
 import sqlite3
 from pathlib import Path
 
-from invokeai.app.services.config.config_default import InvokeAIAppConfig
+from invokeai.app.services.config import InvokeAIAppConfig
 from invokeai.app.services.shared.sqlite_migrator.sqlite_migrator_common import Migration
 
 
diff --git a/invokeai/backend/image_util/depth_anything/__init__.py b/invokeai/backend/image_util/depth_anything/__init__.py
index c854fba3f23..ac3692cec80 100644
--- a/invokeai/backend/image_util/depth_anything/__init__.py
+++ b/invokeai/backend/image_util/depth_anything/__init__.py
@@ -9,7 +9,7 @@
 from PIL import Image
 from torchvision.transforms import Compose
 
-from invokeai.app.services.config.config_default import get_config
+from invokeai.app.services.config import get_config
 from invokeai.app.util.download_with_progress import download_with_progress_bar
 from invokeai.backend.image_util.depth_anything.model.dpt import DPT_DINOv2
 from invokeai.backend.image_util.depth_anything.utilities.util import NormalizeImage, PrepareForNet, Resize
diff --git a/invokeai/backend/image_util/dw_openpose/wholebody.py b/invokeai/backend/image_util/dw_openpose/wholebody.py
index 84f5afa989e..750f480fb23 100644
--- a/invokeai/backend/image_util/dw_openpose/wholebody.py
+++ b/invokeai/backend/image_util/dw_openpose/wholebody.py
@@ -5,7 +5,7 @@
 import numpy as np
 import onnxruntime as ort
 
-from invokeai.app.services.config.config_default import get_config
+from invokeai.app.services.config import get_config
 from invokeai.app.util.download_with_progress import download_with_progress_bar
 from invokeai.backend.util.devices import TorchDevice
 
diff --git a/invokeai/backend/image_util/infill_methods/lama.py b/invokeai/backend/image_util/infill_methods/lama.py
index 4268ec773d4..247dcb83c4e 100644
--- a/invokeai/backend/image_util/infill_methods/lama.py
+++ b/invokeai/backend/image_util/infill_methods/lama.py
@@ -6,7 +6,7 @@
 from PIL import Image
 
 import invokeai.backend.util.logging as logger
-from invokeai.app.services.config.config_default import get_config
+from invokeai.app.services.config import get_config
 from invokeai.app.util.download_with_progress import download_with_progress_bar
 from invokeai.backend.util.devices import TorchDevice
 
diff --git a/invokeai/backend/image_util/infill_methods/patchmatch.py b/invokeai/backend/image_util/infill_methods/patchmatch.py
index 7e9cdf8fa41..0ed05a1ab66 100644
--- a/invokeai/backend/image_util/infill_methods/patchmatch.py
+++ b/invokeai/backend/image_util/infill_methods/patchmatch.py
@@ -9,7 +9,7 @@
 from PIL import Image
 
 import invokeai.backend.util.logging as logger
-from invokeai.app.services.config.config_default import get_config
+from invokeai.app.services.config import get_config
 
 
 class PatchMatch:
diff --git a/invokeai/backend/image_util/invisible_watermark.py b/invokeai/backend/image_util/invisible_watermark.py
index 84342e442fc..18c87dbffd2 100644
--- a/invokeai/backend/image_util/invisible_watermark.py
+++ b/invokeai/backend/image_util/invisible_watermark.py
@@ -10,7 +10,7 @@
 from PIL import Image
 
 import invokeai.backend.util.logging as logger
-from invokeai.app.services.config.config_default import get_config
+from invokeai.app.services.config import get_config
 
 config = get_config()
 
diff --git a/invokeai/backend/image_util/safety_checker.py b/invokeai/backend/image_util/safety_checker.py
index ab09a296197..7a8afd45804 100644
--- a/invokeai/backend/image_util/safety_checker.py
+++ b/invokeai/backend/image_util/safety_checker.py
@@ -12,7 +12,7 @@
 from transformers import AutoFeatureExtractor
 
 import invokeai.backend.util.logging as logger
-from invokeai.app.services.config.config_default import get_config
+from invokeai.app.services.config import get_config
 from invokeai.backend.util.devices import TorchDevice
 from invokeai.backend.util.silence_warnings import SilenceWarnings
 
diff --git a/invokeai/backend/stable_diffusion/diffusers_pipeline.py b/invokeai/backend/stable_diffusion/diffusers_pipeline.py
index 8b90c815ae7..cac3f58d08a 100644
--- a/invokeai/backend/stable_diffusion/diffusers_pipeline.py
+++ b/invokeai/backend/stable_diffusion/diffusers_pipeline.py
@@ -20,7 +20,7 @@
 from pydantic import Field
 from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
 
-from invokeai.app.services.config.config_default import get_config
+from invokeai.app.services.config import get_config
 from invokeai.backend.stable_diffusion.diffusion.conditioning_data import IPAdapterData, TextConditioningData
 from invokeai.backend.stable_diffusion.diffusion.shared_invokeai_diffusion import InvokeAIDiffuserComponent
 from invokeai.backend.stable_diffusion.diffusion.unet_attention_patcher import UNetAttentionPatcher, UNetIPAdapterData
diff --git a/invokeai/backend/stable_diffusion/diffusion/shared_invokeai_diffusion.py b/invokeai/backend/stable_diffusion/diffusion/shared_invokeai_diffusion.py
index f418133e49f..c3552088310 100644
--- a/invokeai/backend/stable_diffusion/diffusion/shared_invokeai_diffusion.py
+++ b/invokeai/backend/stable_diffusion/diffusion/shared_invokeai_diffusion.py
@@ -6,7 +6,7 @@
 import torch
 from typing_extensions import TypeAlias
 
-from invokeai.app.services.config.config_default import get_config
+from invokeai.app.services.config import get_config
 from invokeai.backend.stable_diffusion.diffusion.conditioning_data import (
     IPAdapterData,
     Range,
diff --git a/invokeai/backend/util/devices.py b/invokeai/backend/util/devices.py
index e8380dc8bcd..b7320bc9f05 100644
--- a/invokeai/backend/util/devices.py
+++ b/invokeai/backend/util/devices.py
@@ -3,7 +3,7 @@
 import torch
 from deprecated import deprecated
 
-from invokeai.app.services.config.config_default import get_config
+from invokeai.app.services.config import get_config
 
 # legacy APIs
 TorchPrecisionNames = Literal["float32", "float16", "bfloat16"]
diff --git a/invokeai/backend/util/logging.py b/invokeai/backend/util/logging.py
index 968604eb3d9..217a1a6cb87 100644
--- a/invokeai/backend/util/logging.py
+++ b/invokeai/backend/util/logging.py
@@ -180,8 +180,7 @@
 from pathlib import Path
 from typing import Any, Dict, Optional
 
-from invokeai.app.services.config import InvokeAIAppConfig
-from invokeai.app.services.config.config_default import get_config
+from invokeai.app.services.config import InvokeAIAppConfig, get_config
 
 try:
     import syslog
diff --git a/tests/test_config.py b/tests/test_config.py
index a6ea2a34806..0a451135cee 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -1,22 +1,35 @@
+from contextlib import contextmanager
 from pathlib import Path
 from tempfile import TemporaryDirectory
-from typing import Any
+from typing import Generator
 
 import pytest
-from omegaconf import OmegaConf
+import yaml
+from packaging.version import Version
 from pydantic import ValidationError
 
+from invokeai.app.invocations.baseinvocation import BaseInvocation
+from invokeai.app.services.config.config_common import AppConfigDict, ConfigMigration
 from invokeai.app.services.config.config_default import (
     DefaultInvokeAIAppConfig,
     InvokeAIAppConfig,
-    get_config,
-    load_and_migrate_config,
 )
+from invokeai.app.services.config.config_migrate import ConfigMigrator, get_config, load_and_migrate_config
+from invokeai.app.services.config.migrations import migrate_v300_to_v400, migrate_v400_to_v401
+from invokeai.app.services.shared.graph import Graph
 from invokeai.frontend.cli.arg_parser import InvokeAIArgs
 
+invalid_v4_0_1_config = """
+schema_version: 4.0.1
+
+host: "192.168.1.1"
+port: "ice cream"
+"""
+
 v4_config = """
 schema_version: 4.0.0
 
+precision: autocast
 host: "192.168.1.1"
 port: 8080
 """
@@ -59,20 +72,104 @@
 """
 
 
-@pytest.fixture
-def patch_rootdir(tmp_path: Path, monkeypatch: Any) -> None:
-    """This may be overkill since the current tests don't need the root dir to exist"""
-    monkeypatch.setenv("INVOKEAI_ROOT", str(tmp_path))
+def test_config_migrator_registers_migrations() -> None:
+    """Test that the config migrator registers migrations."""
+    migrator = ConfigMigrator()
+
+    def migration_func(config: AppConfigDict) -> AppConfigDict:
+        return config
+
+    migration_1 = ConfigMigration(from_version=Version("3.0.0"), to_version=Version("4.0.0"), function=migration_func)
+    migration_2 = ConfigMigration(from_version=Version("4.0.0"), to_version=Version("5.0.0"), function=migration_func)
+
+    migrator.register(migration_1)
+    assert migrator._migrations == {migration_1}
+    migrator.register(migration_2)
+    assert migrator._migrations == {migration_1, migration_2}
+
+
+def test_config_migrator_rejects_duplicate_migrations() -> None:
+    """Test that the config migrator rejects duplicate migrations."""
+    migrator = ConfigMigrator()
+
+    def migration_func(config: AppConfigDict) -> AppConfigDict:
+        return config
+
+    migration_1 = ConfigMigration(from_version=Version("3.0.0"), to_version=Version("4.0.0"), function=migration_func)
+    migrator.register(migration_1)
+
+    # Re-register the same migration
+    with pytest.raises(
+        ValueError,
+        match=f"A migration from {migration_1.from_version} or to {migration_1.to_version} has already been registered.",
+    ):
+        migrator.register(migration_1)
+
+    # Register a migration with the same from_version
+    migration_2 = ConfigMigration(from_version=Version("3.0.0"), to_version=Version("5.0.0"), function=migration_func)
+    with pytest.raises(
+        ValueError,
+        match=f"A migration from {migration_2.from_version} or to {migration_2.to_version} has already been registered.",
+    ):
+        migrator.register(migration_2)
+
+    # Register a migration with the same to_version
+    migration_3 = ConfigMigration(from_version=Version("3.0.1"), to_version=Version("4.0.0"), function=migration_func)
+    with pytest.raises(
+        ValueError,
+        match=f"A migration from {migration_3.from_version} or to {migration_3.to_version} has already been registered.",
+    ):
+        migrator.register(migration_3)
+
+
+def test_config_migrator_contiguous_migrations() -> None:
+    """Test that the config migrator requires contiguous migrations."""
+    migrator = ConfigMigrator()
+
+    def migration_1_func(config: AppConfigDict) -> AppConfigDict:
+        return {"schema_version": "4.0.0"}
+
+    def migration_3_func(config: AppConfigDict) -> AppConfigDict:
+        return {"schema_version": "6.0.0"}
+
+    migration_1 = ConfigMigration(from_version=Version("3.0.0"), to_version=Version("4.0.0"), function=migration_1_func)
+    migration_3 = ConfigMigration(from_version=Version("5.0.0"), to_version=Version("6.0.0"), function=migration_3_func)
+
+    migrator.register(migration_1)
+    migrator.register(migration_3)
+    with pytest.raises(ValueError, match="Migration functions are not continuous"):
+        migrator._check_for_discontinuities(migrator._migrations)
+
+
+def test_config_migrator_runs_migrations() -> None:
+    """Test that the config migrator runs migrations."""
+    migrator = ConfigMigrator()
+
+    def migration_1_func(config: AppConfigDict) -> AppConfigDict:
+        return {"schema_version": "4.0.0"}
+
+    def migration_2_func(config: AppConfigDict) -> AppConfigDict:
+        return {"schema_version": "5.0.0"}
 
+    migration_1 = ConfigMigration(from_version=Version("3.0.0"), to_version=Version("4.0.0"), function=migration_1_func)
+    migration_2 = ConfigMigration(from_version=Version("4.0.0"), to_version=Version("5.0.0"), function=migration_2_func)
 
-def test_path_resolution_root_not_set(patch_rootdir: None):
+    migrator.register(migration_1)
+    migrator.register(migration_2)
+
+    original_config = {"schema_version": "3.0.0"}
+    migrated_config = migrator.run_migrations(original_config)
+    assert migrated_config == {"schema_version": "5.0.0"}
+
+
+def test_path_resolution_root_not_set():
     """Test path resolutions when the root is not explicitly set."""
     config = InvokeAIAppConfig()
     expected_root = InvokeAIAppConfig.find_root()
     assert config.root_path == expected_root
 
 
-def test_read_config_from_file(tmp_path: Path, patch_rootdir: None):
+def test_read_config_from_file(tmp_path: Path):
     """Test reading configuration from a file."""
     temp_config_file = tmp_path / "temp_invokeai.yaml"
     temp_config_file.write_text(v4_config)
@@ -82,12 +179,10 @@ def test_read_config_from_file(tmp_path: Path, patch_rootdir: None):
     assert config.port == 8080
 
 
-def test_migrate_v3_config_from_file(tmp_path: Path, patch_rootdir: None):
+def test_migration_1_migrates_settings(tmp_path: Path):
     """Test reading configuration from a file."""
-    temp_config_file = tmp_path / "temp_invokeai.yaml"
-    temp_config_file.write_text(v3_config)
-
-    config = load_and_migrate_config(temp_config_file)
+    migrated_config_dict = migrate_v300_to_v400(yaml.safe_load(v3_config))
+    config = InvokeAIAppConfig.model_validate(migrated_config_dict)
     assert config.outputs_dir == Path("/some/outputs/dir")
     assert config.host == "192.168.1.1"
     assert config.port == 8080
@@ -111,20 +206,18 @@ def test_migrate_v3_config_from_file(tmp_path: Path, patch_rootdir: None):
         ("full/custom/path", Path("full/custom/path"), True),
     ],
 )
-def test_migrate_v3_legacy_conf_dir_defaults(
-    tmp_path: Path, patch_rootdir: None, legacy_conf_dir: str, expected_value: Path, expected_is_set: bool
+def test_migration_1_handles_legacy_conf_dir_defaults(
+    legacy_conf_dir: str, expected_value: Path, expected_is_set: bool
 ):
     """Test reading configuration from a file."""
     config_content = f"InvokeAI:\n    Paths:\n        legacy_conf_dir: {legacy_conf_dir}"
-    temp_config_file = tmp_path / "temp_invokeai.yaml"
-    temp_config_file.write_text(config_content)
-
-    config = load_and_migrate_config(temp_config_file)
+    migrated_config_dict = migrate_v300_to_v400(yaml.safe_load(config_content))
+    config = InvokeAIAppConfig.model_validate(migrated_config_dict)
     assert config.legacy_conf_dir == expected_value
     assert ("legacy_conf_dir" in config.model_fields_set) is expected_is_set
 
 
-def test_migrate_v3_backup(tmp_path: Path, patch_rootdir: None):
+def test_load_and_migrate_backs_up_file(tmp_path: Path):
     """Test the backup of the config file."""
     temp_config_file = tmp_path / "temp_invokeai.yaml"
     temp_config_file.write_text(v3_config)
@@ -134,7 +227,15 @@ def test_migrate_v3_backup(tmp_path: Path, patch_rootdir: None):
     assert temp_config_file.with_suffix(".yaml.bak").read_text() == v3_config
 
 
-def test_failed_migrate_backup(tmp_path: Path, patch_rootdir: None):
+def test_migration_2_migrates_settings():
+    """Test migration from 4.0.0 to 4.0.1"""
+    migrated_config_dict = migrate_v400_to_v401(yaml.safe_load(v4_config))
+    config = InvokeAIAppConfig.model_validate(migrated_config_dict)
+    assert Version(config.schema_version) == Version("4.0.1")
+    assert config.precision == "auto"  # we expect 'autocast' to be replaced with 'auto' during 4.0.1 migration
+
+
+def test_load_and_migrate_failed_migrate_backup(tmp_path: Path):
     """Test the failed migration of the config file."""
     temp_config_file = tmp_path / "temp_invokeai.yaml"
     temp_config_file.write_text(v3_config_with_bad_values)
@@ -147,7 +248,7 @@ def test_failed_migrate_backup(tmp_path: Path, patch_rootdir: None):
     assert temp_config_file.read_text() == v3_config_with_bad_values
 
 
-def test_bails_on_invalid_config(tmp_path: Path, patch_rootdir: None):
+def test_load_and_migrate_bails_on_invalid_config(tmp_path: Path):
     """Test reading configuration from a file."""
     temp_config_file = tmp_path / "temp_invokeai.yaml"
     temp_config_file.write_text(invalid_config)
@@ -156,16 +257,18 @@ def test_bails_on_invalid_config(tmp_path: Path, patch_rootdir: None):
         load_and_migrate_config(temp_config_file)
 
 
-def test_bails_on_config_with_unsupported_version(tmp_path: Path, patch_rootdir: None):
+@pytest.mark.parametrize("config_content", [invalid_v5_config, invalid_v4_0_1_config])
+def test_bails_on_config_with_unsupported_version(tmp_path: Path, config_content: str):
     """Test reading configuration from a file."""
     temp_config_file = tmp_path / "temp_invokeai.yaml"
-    temp_config_file.write_text(invalid_v5_config)
+    temp_config_file.write_text(config_content)
 
-    with pytest.raises(RuntimeError, match="Invalid schema version"):
+    #    with pytest.raises(RuntimeError, match="Invalid schema version"):
+    with pytest.raises(RuntimeError):
         load_and_migrate_config(temp_config_file)
 
 
-def test_write_config_to_file(patch_rootdir: None):
+def test_write_config_to_file():
     """Test writing configuration to a file, checking for correct output."""
     with TemporaryDirectory() as tmpdir:
         temp_config_path = Path(tmpdir) / "invokeai.yaml"
@@ -180,7 +283,7 @@ def test_write_config_to_file(patch_rootdir: None):
             assert "port: 8080" in content
 
 
-def test_update_config_with_dict(patch_rootdir: None):
+def test_update_config_with_dict():
     """Test updating the config with a dictionary."""
     config = InvokeAIAppConfig()
     update_dict = {"host": "10.10.10.10", "port": 6060}
@@ -189,7 +292,7 @@ def test_update_config_with_dict(patch_rootdir: None):
     assert config.port == 6060
 
 
-def test_update_config_with_object(patch_rootdir: None):
+def test_update_config_with_object():
     """Test updating the config with another config object."""
     config = InvokeAIAppConfig()
     new_config = InvokeAIAppConfig(host="10.10.10.10", port=6060)
@@ -198,7 +301,7 @@ def test_update_config_with_object(patch_rootdir: None):
     assert config.port == 6060
 
 
-def test_set_and_resolve_paths(patch_rootdir: None):
+def test_set_and_resolve_paths():
     """Test setting root and resolving paths based on it."""
     with TemporaryDirectory() as tmpdir:
         config = InvokeAIAppConfig()
@@ -207,7 +310,7 @@ def test_set_and_resolve_paths(patch_rootdir: None):
         assert config.db_path == Path(tmpdir).resolve() / "databases" / "invokeai.db"
 
 
-def test_singleton_behavior(patch_rootdir: None):
+def test_singleton_behavior():
     """Test that get_config always returns the same instance."""
     get_config.cache_clear()
     config1 = get_config()
@@ -216,13 +319,13 @@ def test_singleton_behavior(patch_rootdir: None):
     get_config.cache_clear()
 
 
-def test_default_config(patch_rootdir: None):
+def test_default_config():
     """Test that the default config is as expected."""
     config = DefaultInvokeAIAppConfig()
     assert config.host == "127.0.0.1"
 
 
-def test_env_vars(patch_rootdir: None, monkeypatch: pytest.MonkeyPatch, tmp_path: Path):
+def test_env_vars(monkeypatch: pytest.MonkeyPatch, tmp_path: Path):
     """Test that environment variables are merged into the config"""
     monkeypatch.setenv("INVOKEAI_ROOT", str(tmp_path))
     monkeypatch.setenv("INVOKEAI_HOST", "1.2.3.4")
@@ -233,7 +336,7 @@ def test_env_vars(patch_rootdir: None, monkeypatch: pytest.MonkeyPatch, tmp_path
     assert config.root_path == tmp_path
 
 
-def test_get_config_writing(patch_rootdir: None, monkeypatch: pytest.MonkeyPatch, tmp_path: Path):
+def test_get_config_writing(monkeypatch: pytest.MonkeyPatch, tmp_path: Path):
     """Test that get_config writes the appropriate files to disk"""
     # Trick the config into thinking it has already parsed args - this triggers the writing of the config file
     InvokeAIArgs.did_parse = True
@@ -265,58 +368,39 @@ def test_get_config_writing(patch_rootdir: None, monkeypatch: pytest.MonkeyPatch
     InvokeAIArgs.did_parse = False
 
 
-@pytest.mark.xfail(
-    reason="""
-    This test fails when run as part of the full test suite.
-
-    This test needs to deny nodes from being included in the InvocationsUnion by providing
-    an app configuration as a test fixture. Pytest executes all test files before running
-    tests, so the app configuration is already initialized by the time this test runs, and
-    the InvocationUnion is already created and the denied nodes are not omitted from it.
+@contextmanager
+def clear_config() -> Generator[None, None, None]:
+    try:
+        yield None
+    finally:
+        get_config.cache_clear()
 
-    This test passes when `test_config.py` is tested in isolation.
 
-    Perhaps a solution would be to call `get_app_config().parse_args()` in
-    other test files?
-    """
+@pytest.mark.xfail(
+    reason="""
+    Currently this test is failing due to an issue described in issue #5983.
+"""
 )
-def test_deny_nodes(patch_rootdir):
-    # Allow integer, string and float, but explicitly deny float
-    allow_deny_nodes_conf = OmegaConf.create(
-        """
-        InvokeAI:
-          Nodes:
-            allow_nodes:
-              - integer
-              - string
-              - float
-            deny_nodes:
-              - float
-        """
-    )
-    # must parse config before importing Graph, so its nodes union uses the config
-    get_config.cache_clear()
-    conf = get_config()
-    get_config.cache_clear()
-    conf.merge_from_file(conf=allow_deny_nodes_conf, argv=[])
-    from invokeai.app.services.shared.graph import Graph
-
-    # confirm graph validation fails when using denied node
-    Graph(nodes={"1": {"id": "1", "type": "integer"}})
-    Graph(nodes={"1": {"id": "1", "type": "string"}})
+def test_deny_nodes():
+    with clear_config():
+        config = get_config()
+        config.allow_nodes = ["integer", "string", "float"]
+        config.deny_nodes = ["float"]
 
-    with pytest.raises(ValidationError):
-        Graph(nodes={"1": {"id": "1", "type": "float"}})
+        # confirm graph validation fails when using denied node
+        Graph(nodes={"1": {"id": "1", "type": "integer"}})
+        Graph(nodes={"1": {"id": "1", "type": "string"}})
 
-    from invokeai.app.invocations.baseinvocation import BaseInvocation
+        with pytest.raises(ValidationError):
+            Graph(nodes={"1": {"id": "1", "type": "float"}})
 
-    # confirm invocations union will not have denied nodes
-    all_invocations = BaseInvocation.get_invocations()
+        # confirm invocations union will not have denied nodes
+        all_invocations = BaseInvocation.get_invocations()
 
-    has_integer = len([i for i in all_invocations if i.model_fields.get("type").default == "integer"]) == 1
-    has_string = len([i for i in all_invocations if i.model_fields.get("type").default == "string"]) == 1
-    has_float = len([i for i in all_invocations if i.model_fields.get("type").default == "float"]) == 1
+        has_integer = len([i for i in all_invocations if i.model_fields.get("type").default == "integer"]) == 1
+        has_string = len([i for i in all_invocations if i.model_fields.get("type").default == "string"]) == 1
+        has_float = len([i for i in all_invocations if i.model_fields.get("type").default == "float"]) == 1
 
-    assert has_integer
-    assert has_string
-    assert not has_float
+        assert has_integer
+        assert has_string
+        assert not has_float