refactor: external importers

* packlist & songlist importer

.github/workflows/main.yml

@@ -0,0 +1,40 @@
+name: test & lint
+
+on:
+  push:
+    branches:
+      - '*'
+  pull_request:
+    types: [opened, reopened]
+  workflow_dispatch:
+
+jobs:
+  pytest:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dev dependencies
+        run: 'pip install .[dev]'
+      - name: Run tests
+        run: 'pytest -v'
+
+  ruff:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Install dev dependencies
+        run: 'pip install .[dev]'
+      - name: Run linter
+        run: 'ruff check'

.github/workflows/test.yml

@@ -1,23 +0,0 @@
-name: Run tests
-on:
-  push:
-    branches:
-      - 'master'
-  pull_request:
-    types: [opened, reopened]
-  workflow_dispatch:
-jobs:
-  pytest:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11']
-
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v4
-        with:
-          python-version: ${{ matrix.python-version }}
-
-      - run: 'pip install -r requirements.dev.txt .'
-      - run: 'pytest -v'

.pre-commit-config.yaml

@@ -4,11 +4,10 @@ repos:
     hooks:
       - id: end-of-file-fixer
       - id: trailing-whitespace
-  - repo: https://github.com/psf/black
-    rev: 23.1.0
+
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.4.4
     hooks:
-      - id: black
-  - repo: https://github.com/PyCQA/isort
-    rev: 5.12.0
-    hooks:
-      - id: isort
+      - id: ruff
+        args: ["--fix"]
+      - id: ruff-format

pyproject.toml

@@ -18,24 +18,34 @@ classifiers = [
   "Programming Language :: Python :: 3",
 ]
 
+[project.optional-dependencies]
+dev = ["ruff~=0.4", "pre-commit~=3.3", "pytest~=7.4", "tox~=4.11"]
+
 [project.urls]
 "Homepage" = "https://github.com/283375/arcaea-offline"
 "Bug Tracker" = "https://github.com/283375/arcaea-offline/issues"
 
-[tool.isort]
-profile = "black"
-src_paths = ["src/arcaea_offline"]
-
 [tool.pyright]
 ignore = ["build/"]
 
-[tool.pylint.main]
-jobs = 0
-
-[tool.pylint.logging]
-disable = [
-  "missing-module-docstring",
-  "missing-class-docstring",
-  "missing-function-docstring",
-  "not-callable", # false positive to sqlalchemy `func.*`, remove this when pylint-dev/pylint(#8138) closed
+[tool.ruff.lint]
+# Full list: https://docs.astral.sh/ruff/rules
+select = [
+  "E",   # pycodestyle (Error)
+  "W",   # pycodestyle (Warning)
+  "F",   # pyflakes
+  "I",   # isort
+  "PL",  # pylint
+  "N",   # pep8-naming
+  "FBT", # flake8-boolean-trap
+  "A",   # flake8-builtins
+  "DTZ", # flake8-datetimez
+  "LOG", # flake8-logging
+  "Q",   # flake8-quotes
+  "G",   # flake8-logging-format
+  "PIE", # flake8-pie
+  "PT",  # flake8-pytest-style
+]
+ignore = [
+  "E501", # line-too-long
 ]

requirements.dev.txt

@@ -1,6 +1,4 @@
-black==23.3.0
-isort==5.12.0
-pre-commit==3.3.1
-pylint==3.0.2
-pytest==7.4.3
-tox==4.11.3
+ruff~=0.4
+pre-commit~=3.3
+pytest~=7.4
+tox~=4.11

src/arcaea_offline/calculators/__init__.py

@@ -1,2 +1,3 @@
-from . import world
 from .play_result import PlayResultCalculators
+
+__all__ = ["PlayResultCalculators"]

src/arcaea_offline/calculators/world/__init__.py

@@ -9,3 +9,17 @@ from .partners import (
     MayaPartnerBonus,
     MithraTerceraPartnerBonus,
 )
+
+__all__ = [
+    "AmaneBelowExPartnerBonus",
+    "AwakenedEtoPartnerBonus",
+    "AwakenedIlithPartnerBonus",
+    "AwakenedLunaPartnerBonus",
+    "LegacyMapStepBooster",
+    "MayaPartnerBonus",
+    "MemoriesStepBooster",
+    "MithraTerceraPartnerBonus",
+    "PartnerBonus",
+    "WorldMainMapCalculators",
+    "WorldPlayResult",
+]

src/arcaea_offline/database/__init__.py

@@ -1 +1,3 @@
 from .db import Database
+
+__all__ = ["Database"]

src/arcaea_offline/database/models/v4/__init__.py

@@ -19,3 +19,24 @@ from .songs import (
     SongsBase,
     SongsViewBase,
 )
+
+__all__ = [
+    "CalculatedPotential",
+    "Chart",
+    "ChartInfo",
+    "ConfigBase",
+    "Difficulty",
+    "DifficultyLocalized",
+    "Pack",
+    "PackLocalized",
+    "Property",
+    "Score",
+    "ScoreBest",
+    "ScoreCalculated",
+    "ScoresBase",
+    "ScoresViewBase",
+    "Song",
+    "SongLocalized",
+    "SongsBase",
+    "SongsViewBase",
+]

src/arcaea_offline/database/models/v4/scores.py

@@ -10,12 +10,12 @@ from .common import ReprHelper
 from .songs import ChartInfo, Difficulty
 
 __all__ = [
-    "ScoresBase",
-    "Score",
-    "ScoresViewBase",
-    "ScoreCalculated",
-    "ScoreBest",
     "CalculatedPotential",
+    "Score",
+    "ScoreBest",
+    "ScoreCalculated",
+    "ScoresBase",
+    "ScoresViewBase",
 ]
 
 

src/arcaea_offline/database/models/v4/songs.py

@@ -9,16 +9,16 @@ from sqlalchemy_utils import create_view
 from .common import ReprHelper
 
 __all__ = [
-    "SongsBase",
+    "Chart",
+    "ChartInfo",
+    "Difficulty",
+    "DifficultyLocalized",
     "Pack",
     "PackLocalized",
     "Song",
     "SongLocalized",
-    "Difficulty",
-    "DifficultyLocalized",
-    "ChartInfo",
+    "SongsBase",
     "SongsViewBase",
-    "Chart",
 ]
 
 

src/arcaea_offline/database/models/v5/__init__.py

@@ -0,0 +1,38 @@
+from .arcaea import (
+    Chart,
+    ChartInfo,
+    Difficulty,
+    DifficultyLocalized,
+    Pack,
+    PackLocalized,
+    Song,
+    SongLocalized,
+    SongSearchWord,
+)
+from .base import ModelsV5Base, ModelsV5ViewBase
+from .config import Property
+from .play_results import (
+    CalculatedPotential,
+    PlayResult,
+    PlayResultBest,
+    PlayResultCalculated,
+)
+
+__all__ = [
+    "CalculatedPotential",
+    "Chart",
+    "ChartInfo",
+    "Difficulty",
+    "DifficultyLocalized",
+    "ModelsV5Base",
+    "ModelsV5ViewBase",
+    "Pack",
+    "PackLocalized",
+    "PlayResult",
+    "PlayResultBest",
+    "PlayResultCalculated",
+    "Property",
+    "Song",
+    "SongLocalized",
+    "SongSearchWord",
+]

src/arcaea_offline/database/models/v5/arcaea.py

@@ -0,0 +1,275 @@
+from typing import List, Optional
+
+from sqlalchemy import ForeignKey, and_, func, select
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+from sqlalchemy_utils import create_view
+
+from arcaea_offline.constants.enums import ArcaeaRatingClass, ArcaeaSongSide
+
+from .base import ModelsV5Base, ModelsV5ViewBase, ReprHelper
+
+__all__ = [
+    "Chart",
+    "ChartInfo",
+    "Difficulty",
+    "DifficultyLocalized",
+    "Pack",
+    "PackLocalized",
+    "Song",
+    "SongLocalized",
+]
+
+
+class Pack(ModelsV5Base, ReprHelper):
+    __tablename__ = "packs"
+
+    id: Mapped[str] = mapped_column(primary_key=True)
+    name: Mapped[str]
+    description: Mapped[Optional[str]]
+
+    songs: Mapped[List["Song"]] = relationship(back_populates="pack", viewonly=True)
+    localized_objects: Mapped[List["PackLocalized"]] = relationship(
+        back_populates="parent", viewonly=True
+    )
+
+
+class PackLocalized(ModelsV5Base, ReprHelper):
+    __tablename__ = "packs_localized"
+
+    pkid: Mapped[int] = mapped_column(primary_key=True)
+    id: Mapped[str] = mapped_column(
+        ForeignKey(Pack.id, onupdate="CASCADE", ondelete="NO ACTION")
+    )
+    lang: Mapped[str]
+    name: Mapped[Optional[str]]
+    description: Mapped[Optional[str]]
+
+    parent: Mapped[Pack] = relationship(viewonly=True)
+
+
+class Song(ModelsV5Base, ReprHelper):
+    __tablename__ = "songs"
+
+    idx: Mapped[int]
+    id: Mapped[str] = mapped_column(primary_key=True)
+    title: Mapped[str]
+    artist: Mapped[str]
+    pack_id: Mapped[str] = mapped_column(
+        ForeignKey(Pack.id, onupdate="CASCADE", ondelete="NO ACTION")
+    )
+    bpm: Mapped[Optional[str]]
+    bpm_base: Mapped[Optional[float]]
+    audio_preview: Mapped[Optional[int]]
+    audio_preview_end: Mapped[Optional[int]]
+    side: Mapped[Optional[ArcaeaSongSide]]
+    version: Mapped[Optional[str]]
+    date: Mapped[Optional[int]]
+    bg: Mapped[Optional[str]]
+    bg_inverse: Mapped[Optional[str]]
+    bg_day: Mapped[Optional[str]]
+    bg_night: Mapped[Optional[str]]
+    source: Mapped[Optional[str]]
+    source_copyright: Mapped[Optional[str]]
+
+    pack: Mapped[Pack] = relationship(viewonly=True)
+    difficulties: Mapped[List["Difficulty"]] = relationship(
+        back_populates="song", viewonly=True
+    )
+    localized_objects: Mapped[List["SongLocalized"]] = relationship(
+        back_populates="parent", viewonly=True
+    )
+
+    @property
+    def charts_info(self):
+        return [d.chart_info for d in self.difficulties if d.chart_info is not None]
+
+
+class SongLocalized(ModelsV5Base, ReprHelper):
+    __tablename__ = "songs_localized"
+
+    pkid: Mapped[int] = mapped_column(primary_key=True)
+    id: Mapped[str] = mapped_column(
+        ForeignKey(Song.id, onupdate="CASCADE", ondelete="NO ACTION")
+    )
+    lang: Mapped[str]
+    title: Mapped[Optional[str]]
+    source: Mapped[Optional[str]]
+
+    parent: Mapped[Song] = relationship(
+        back_populates="localized_objects", viewonly=True
+    )
+
+
+class SongSearchWord(ModelsV5Base, ReprHelper):
+    __tablename__ = "songs_search_words"
+
+    pkid: Mapped[int] = mapped_column(primary_key=True)
+    id: Mapped[str] = mapped_column(
+        ForeignKey(Song.id, onupdate="CASCADE", ondelete="NO ACTION")
+    )
+    lang: Mapped[str]
+    type: Mapped[int] = mapped_column(comment="1: title, 2: artist")
+    value: Mapped[str]
+
+
+class Difficulty(ModelsV5Base, ReprHelper):
+    __tablename__ = "difficulties"
+
+    song_id: Mapped[str] = mapped_column(
+        ForeignKey(Song.id, onupdate="CASCADE", ondelete="NO ACTION"),
+        primary_key=True,
+    )
+    rating_class: Mapped[ArcaeaRatingClass] = mapped_column(primary_key=True)
+    rating: Mapped[int]
+    rating_plus: Mapped[bool]
+    chart_designer: Mapped[Optional[str]]
+    jacket_desginer: Mapped[Optional[str]]
+    audio_override: Mapped[bool] = mapped_column(default=False)
+    jacket_override: Mapped[bool] = mapped_column(default=False)
+    jacket_night: Mapped[Optional[str]]
+    title: Mapped[Optional[str]]
+    artist: Mapped[Optional[str]]
+    bg: Mapped[Optional[str]]
+    bg_inverse: Mapped[Optional[str]]
+    bpm: Mapped[Optional[str]]
+    bpm_base: Mapped[Optional[float]]
+    version: Mapped[Optional[str]]
+    date: Mapped[Optional[int]]
+
+    song: Mapped[Song] = relationship(back_populates="difficulties", viewonly=True)
+    chart_info: Mapped[Optional["ChartInfo"]] = relationship(
+        primaryjoin=(
+            "and_(Difficulty.song_id==ChartInfo.song_id, "
+            "Difficulty.rating_class==ChartInfo.rating_class)"
+        ),
+        viewonly=True,
+    )
+    localized_objects: Mapped[List["DifficultyLocalized"]] = relationship(
+        primaryjoin=(
+            "and_(Difficulty.song_id==DifficultyLocalized.song_id, "
+            "Difficulty.rating_class==DifficultyLocalized.rating_class)"
+        ),
+        viewonly=True,
+    )
+
+
+class DifficultyLocalized(ModelsV5Base, ReprHelper):
+    __tablename__ = "difficulties_localized"
+
+    pkid: Mapped[int] = mapped_column(primary_key=True)
+    song_id: Mapped[str] = mapped_column(
+        ForeignKey(Difficulty.song_id, onupdate="CASCADE", ondelete="NO ACTION")
+    )
+    rating_class: Mapped[ArcaeaRatingClass] = mapped_column(
+        ForeignKey(Difficulty.rating_class, onupdate="CASCADE", ondelete="NO ACTION")
+    )
+    lang: Mapped[str]
+    title: Mapped[Optional[str]]
+    artist: Mapped[Optional[str]]
+
+    parent: Mapped[Difficulty] = relationship(
+        primaryjoin=and_(
+            Difficulty.song_id == song_id, Difficulty.rating_class == rating_class
+        ),
+        viewonly=True,
+    )
+
+
+class ChartInfo(ModelsV5Base, ReprHelper):
+    __tablename__ = "charts_info"
+
+    song_id: Mapped[str] = mapped_column(
+        ForeignKey(Difficulty.song_id, onupdate="CASCADE", ondelete="NO ACTION"),
+        primary_key=True,
+    )
+    rating_class: Mapped[ArcaeaRatingClass] = mapped_column(
+        ForeignKey(Difficulty.rating_class, onupdate="CASCADE", ondelete="NO ACTION"),
+        primary_key=True,
+    )
+    constant: Mapped[int] = mapped_column(
+        comment="real_constant * 10. For example, Crimson Throne [FTR] is 10.4, then store 104."
+    )
+    notes: Mapped[Optional[int]]
+
+    difficulty: Mapped[Difficulty] = relationship(
+        primaryjoin=and_(
+            Difficulty.song_id == song_id, Difficulty.rating_class == rating_class
+        ),
+        viewonly=True,
+    )
+
+
+class Chart(ModelsV5ViewBase, ReprHelper):
+    __tablename__ = "charts"
+
+    song_idx: Mapped[int]
+    song_id: Mapped[str]
+    rating_class: Mapped[ArcaeaRatingClass]
+    rating: Mapped[int]
+    rating_plus: Mapped[bool]
+    title: Mapped[str]
+    artist: Mapped[str]
+    pack_id: Mapped[str]
+    bpm: Mapped[Optional[str]]
+    bpm_base: Mapped[Optional[float]]
+    audio_preview: Mapped[Optional[int]]
+    audio_preview_end: Mapped[Optional[int]]
+    side: Mapped[Optional[int]]
+    version: Mapped[Optional[str]]
+    date: Mapped[Optional[int]]
+    bg: Mapped[Optional[str]]
+    bg_inverse: Mapped[Optional[str]]
+    bg_day: Mapped[Optional[str]]
+    bg_night: Mapped[Optional[str]]
+    source: Mapped[Optional[str]]
+    source_copyright: Mapped[Optional[str]]
+    chart_designer: Mapped[Optional[str]]
+    jacket_desginer: Mapped[Optional[str]]
+    audio_override: Mapped[bool]
+    jacket_override: Mapped[bool]
+    jacket_night: Mapped[Optional[str]]
+    constant: Mapped[int]
+    notes: Mapped[Optional[int]]
+
+    __table__ = create_view(
+        name=__tablename__,
+        selectable=select(
+            Song.idx.label("song_idx"),
+            Difficulty.song_id,
+            Difficulty.rating_class,
+            Difficulty.rating,
+            Difficulty.rating_plus,
+            func.coalesce(Difficulty.title, Song.title).label("title"),
+            func.coalesce(Difficulty.artist, Song.artist).label("artist"),
+            Song.pack_id,
+            func.coalesce(Difficulty.bpm, Song.bpm).label("bpm"),
+            func.coalesce(Difficulty.bpm_base, Song.bpm_base).label("bpm_base"),
+            Song.audio_preview,
+            Song.audio_preview_end,
+            Song.side,
+            func.coalesce(Difficulty.version, Song.version).label("version"),
+            func.coalesce(Difficulty.date, Song.date).label("date"),
+            func.coalesce(Difficulty.bg, Song.bg).label("bg"),
+            func.coalesce(Difficulty.bg_inverse, Song.bg_inverse).label("bg_inverse"),
+            Song.bg_day,
+            Song.bg_night,
+            Song.source,
+            Song.source_copyright,
+            Difficulty.chart_designer,
+            Difficulty.jacket_desginer,
+            Difficulty.audio_override,
+            Difficulty.jacket_override,
+            Difficulty.jacket_night,
+            ChartInfo.constant,
+            ChartInfo.notes,
+        )
+        .select_from(Difficulty)
+        .join(
+            ChartInfo,
+            (Difficulty.song_id == ChartInfo.song_id)
+            & (Difficulty.rating_class == ChartInfo.rating_class),
+        )
+        .join(Song, Difficulty.song_id == Song.id),
+        metadata=ModelsV5ViewBase.metadata,
+        cascade_on_drop=False,
+    )

src/arcaea_offline/database/models/v5/base.py

@@ -0,0 +1,62 @@
+from datetime import datetime
+
+from sqlalchemy.orm import DeclarativeBase
+from sqlalchemy.orm.exc import DetachedInstanceError
+
+from arcaea_offline.constants.enums import (
+    ArcaeaPlayResultClearType,
+    ArcaeaPlayResultModifier,
+    ArcaeaRatingClass,
+    ArcaeaSongSide,
+)
+
+from .._custom_types import DbIntEnum, TZDateTime
+
+TYPE_ANNOTATION_MAP = {
+    datetime: TZDateTime,
+    ArcaeaRatingClass: DbIntEnum(ArcaeaRatingClass),
+    ArcaeaSongSide: DbIntEnum(ArcaeaSongSide),
+    ArcaeaPlayResultClearType: DbIntEnum(ArcaeaPlayResultClearType),
+    ArcaeaPlayResultModifier: DbIntEnum(ArcaeaPlayResultModifier),
+}
+
+
+class ModelsV5Base(DeclarativeBase):
+    type_annotation_map = TYPE_ANNOTATION_MAP
+
+
+class ModelsV5ViewBase(DeclarativeBase):
+    type_annotation_map = TYPE_ANNOTATION_MAP
+
+
+class ReprHelper:
+    # pylint: disable=no-member
+
+    def _repr(self, **kwargs) -> str:
+        """
+        Helper for __repr__
+
+        https://stackoverflow.com/a/55749579/16484891
+
+        CC BY-SA 4.0
+        """
+        field_strings = []
+        at_least_one_attached_attribute = False
+        for key, field in kwargs.items():
+            try:
+                field_strings.append(f"{key}={field!r}")
+            except DetachedInstanceError:
+                field_strings.append(f"{key}=DetachedInstanceError")
+            else:
+                at_least_one_attached_attribute = True
+
+        if at_least_one_attached_attribute:
+            return f"<{self.__class__.__name__}({', '.join(field_strings)})>"
+        return f"<{self.__class__.__name__} {id(self)}>"
+
+    def __repr__(self):
+        if isinstance(self, DeclarativeBase):
+            return self._repr(
+                **{c.key: getattr(self, c.key) for c in self.__table__.columns}
+            )
+        return super().__repr__()

src/arcaea_offline/database/models/v5/config.py

@@ -0,0 +1,12 @@
+from sqlalchemy.orm import Mapped, mapped_column
+
+from .base import ModelsV5Base, ReprHelper
+
+__all__ = ["Property"]
+
+
+class Property(ModelsV5Base, ReprHelper):
+    __tablename__ = "properties"
+
+    key: Mapped[str] = mapped_column(primary_key=True)
+    value: Mapped[str] = mapped_column()

src/arcaea_offline/database/models/v5/play_results.py

@@ -0,0 +1,197 @@
+from datetime import datetime, timezone
+from typing import Optional
+
+from sqlalchemy import ForeignKey, and_, case, func, inspect, select, text
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+from sqlalchemy_utils import create_view
+
+from arcaea_offline.constants.enums import (
+    ArcaeaPlayResultClearType,
+    ArcaeaPlayResultModifier,
+    ArcaeaRatingClass,
+)
+
+from .arcaea import ChartInfo, Difficulty
+from .base import ModelsV5Base, ModelsV5ViewBase, ReprHelper
+
+__all__ = [
+    "CalculatedPotential",
+    "PlayResult",
+    "PlayResultBest",
+    "PlayResultCalculated",
+]
+
+
+class PlayResult(ModelsV5Base, ReprHelper):
+    __tablename__ = "play_results"
+
+    id: Mapped[int] = mapped_column(autoincrement=True, primary_key=True)
+    song_id: Mapped[str] = mapped_column(
+        ForeignKey(Difficulty.song_id, onupdate="CASCADE", ondelete="NO ACTION"),
+        index=True,
+    )
+    rating_class: Mapped[ArcaeaRatingClass] = mapped_column(
+        ForeignKey(Difficulty.rating_class, onupdate="CASCADE", ondelete="NO ACTION"),
+        index=True,
+    )
+    score: Mapped[int]
+    pure: Mapped[Optional[int]]
+    far: Mapped[Optional[int]]
+    lost: Mapped[Optional[int]]
+    date: Mapped[Optional[datetime]] = mapped_column(
+        default=lambda: datetime.now(timezone.utc)
+    )
+    max_recall: Mapped[Optional[int]]
+    modifier: Mapped[Optional[ArcaeaPlayResultModifier]]
+    clear_type: Mapped[Optional[ArcaeaPlayResultClearType]]
+    comment: Mapped[Optional[str]]
+
+    difficulty: Mapped[Difficulty] = relationship(
+        primaryjoin=and_(
+            song_id == Difficulty.song_id,
+            rating_class == Difficulty.rating_class,
+        ),
+        viewonly=True,
+    )
+
+
+# How to create an SQL View with SQLAlchemy?
+# https://stackoverflow.com/a/53253105/16484891
+# CC BY-SA 4.0
+
+
+class PlayResultCalculated(ModelsV5ViewBase, ReprHelper):
+    __tablename__ = "play_results_calculated"
+
+    id: Mapped[int]
+    song_id: Mapped[str]
+    rating_class: Mapped[ArcaeaRatingClass]
+    score: Mapped[int]
+    pure: Mapped[Optional[int]]
+    shiny_pure: Mapped[Optional[int]]
+    far: Mapped[Optional[int]]
+    lost: Mapped[Optional[int]]
+    date: Mapped[Optional[datetime]]
+    max_recall: Mapped[Optional[int]]
+    modifier: Mapped[Optional[ArcaeaPlayResultModifier]]
+    clear_type: Mapped[Optional[ArcaeaPlayResultClearType]]
+    potential: Mapped[float]
+    comment: Mapped[Optional[str]]
+
+    __table__ = create_view(
+        name=__tablename__,
+        selectable=select(
+            PlayResult.id,
+            Difficulty.song_id,
+            Difficulty.rating_class,
+            PlayResult.score,
+            PlayResult.pure,
+            (
+                case(
+                    (
+                        (
+                            ChartInfo.notes.is_not(None)
+                            & PlayResult.pure.is_not(None)
+                            & PlayResult.far.is_not(None)
+                            & (ChartInfo.notes != 0)
+                        ),
+                        PlayResult.score
+                        - func.floor(
+                            (PlayResult.pure * 10000000.0 / ChartInfo.notes)
+                            + (PlayResult.far * 0.5 * 10000000.0 / ChartInfo.notes)
+                        ),
+                    ),
+                    else_=text("NULL"),
+                )
+            ).label("shiny_pure"),
+            PlayResult.far,
+            PlayResult.lost,
+            PlayResult.date,
+            PlayResult.max_recall,
+            PlayResult.modifier,
+            PlayResult.clear_type,
+            case(
+                (PlayResult.score >= 10000000, ChartInfo.constant / 10.0 + 2),  # noqa: PLR2004
+                (
+                    PlayResult.score >= 9800000,  # noqa: PLR2004
+                    ChartInfo.constant / 10.0
+                    + 1
+                    + (PlayResult.score - 9800000) / 200000.0,
+                ),
+                else_=func.max(
+                    (ChartInfo.constant / 10.0)
+                    + (PlayResult.score - 9500000) / 300000.0,
+                    0,
+                ),
+            ).label("potential"),
+            PlayResult.comment,
+        )
+        .select_from(Difficulty)
+        .join(
+            ChartInfo,
+            (Difficulty.song_id == ChartInfo.song_id)
+            & (Difficulty.rating_class == ChartInfo.rating_class),
+        )
+        .join(
+            PlayResult,
+            (Difficulty.song_id == PlayResult.song_id)
+            & (Difficulty.rating_class == PlayResult.rating_class),
+        ),
+        metadata=ModelsV5ViewBase.metadata,
+        cascade_on_drop=False,
+    )
+
+
+class PlayResultBest(ModelsV5ViewBase, ReprHelper):
+    __tablename__ = "play_results_best"
+
+    id: Mapped[int]
+    song_id: Mapped[str]
+    rating_class: Mapped[int]
+    score: Mapped[int]
+    pure: Mapped[Optional[int]]
+    shiny_pure: Mapped[Optional[int]]
+    far: Mapped[Optional[int]]
+    lost: Mapped[Optional[int]]
+    date: Mapped[Optional[datetime]]
+    max_recall: Mapped[Optional[int]]
+    modifier: Mapped[Optional[ArcaeaPlayResultModifier]]
+    clear_type: Mapped[Optional[ArcaeaPlayResultClearType]]
+    potential: Mapped[float]
+    comment: Mapped[Optional[str]]
+
+    __table__ = create_view(
+        name=__tablename__,
+        selectable=select(
+            *[
+                col
+                for col in inspect(PlayResultCalculated).columns
+                if col.name != "potential"
+            ],
+            func.max(PlayResultCalculated.potential).label("potential"),
+        )
+        .select_from(PlayResultCalculated)
+        .group_by(PlayResultCalculated.song_id, PlayResultCalculated.rating_class)
+        .order_by(PlayResultCalculated.potential.desc()),
+        metadata=ModelsV5ViewBase.metadata,
+        cascade_on_drop=False,
+    )
+
+
+class CalculatedPotential(ModelsV5ViewBase, ReprHelper):
+    __tablename__ = "calculated_potential"
+
+    b30: Mapped[float]
+
+    _select_bests_subquery = (
+        select(PlayResultBest.potential.label("b30_sum"))
+        .order_by(PlayResultBest.potential.desc())
+        .limit(30)
+        .subquery()
+    )
+    __table__ = create_view(
+        name=__tablename__,
+        selectable=select(func.avg(_select_bests_subquery.c.b30_sum).label("b30")),
+        metadata=ModelsV5ViewBase.metadata,
+        cascade_on_drop=False,
+    )

src/arcaea_offline/external/andreal/__init__.py

@@ -1 +1,3 @@
 from .api_data import AndrealImageGeneratorApiDataConverter
+
+__all__ = ["AndrealImageGeneratorApiDataConverter"]

src/arcaea_offline/external/arcaea/__init__.py

@@ -2,3 +2,11 @@ from .online import ArcaeaOnlineParser
 from .packlist import PacklistParser
 from .songlist import SonglistDifficultiesParser, SonglistParser
 from .st3 import St3ScoreParser
+
+__all__ = [
+    "ArcaeaOnlineParser",
+    "PacklistParser",
+    "SonglistDifficultiesParser",
+    "SonglistParser",
+    "St3ScoreParser",
+]

src/arcaea_offline/external/arcsong/__init__.py

@@ -1 +1,3 @@
 from .arcsong_db import ArcsongDbParser
+
+__all__ = ["ArcsongDbParser"]

src/arcaea_offline/external/arcsong/arcsong_db.py

@@ -3,7 +3,7 @@ from typing import List
 
 from sqlalchemy.orm import Session
 
-from ...models.songs import ChartInfo
+from arcaea_offline.database.models.v4 import ChartInfo
 
 
 class ArcsongDbParser:

src/arcaea_offline/external/arcsong/arcsong_json.py

@@ -5,7 +5,7 @@ from typing import List, Optional, TypedDict
 from sqlalchemy import func, select
 from sqlalchemy.orm import Session
 
-from ...models import (
+from arcaea_offline.database.models.v4 import (
     ChartInfo,
     Difficulty,
     DifficultyLocalized,

src/arcaea_offline/external/chart_info_db/__init__.py

@@ -1 +1,3 @@
 from .parser import ChartInfoDbParser
+
+__all__ = ["ChartInfoDbParser"]

src/arcaea_offline/external/exports/__init__.py

@@ -1,2 +0,0 @@
-from . import exporters
-from .types import ArcaeaOfflineDEFV2_Score, ScoreExport

src/arcaea_offline/external/exports/exporters.py

@@ -1,4 +1,5 @@
-from ...models import Score
+from arcaea_offline.database.models.v4 import Score
+
 from .types import ArcaeaOfflineDEFV2_ScoreItem, ScoreExport
 
 

src/arcaea_offline/external/importers/arcaea/common.py

@@ -0,0 +1,31 @@
+from typing import Union
+
+
+def fix_timestamp(timestamp: int) -> Union[int, None]:
+    """
+    Some of the `date` column in st3 are unexpectedly truncated. For example,
+    a `1670283375` may be truncated to `167028`, even a single `1`.
+
+    To properly handle this:
+
+    If `timestamp > 1489017600` (the release date of Arcaea), consider it's ok.
+
+    Otherwise, if the timestamp is 'fixable'
+    (`1489 <= timestamp <= 9999` or `timestamp > 14889`),
+    pad zeros to the end of timestamp.
+    For example, a `1566` will be padded to `1566000000`.
+
+    Otherwise, treat the timestamp as `None`.
+
+    :param timestamp: `date` value
+    """
+    if timestamp > 1489017600:  # noqa: PLR2004
+        return timestamp
+
+    timestamp_fixable = 1489 <= timestamp <= 9999 or timestamp > 14889  # noqa: PLR2004
+    if not timestamp_fixable:
+        return None
+
+    timestamp_str = str(timestamp)
+    timestamp_str = timestamp_str.ljust(10, "0")
+    return int(timestamp_str, 10)

src/arcaea_offline/external/importers/arcaea/lists.py

@@ -0,0 +1,178 @@
+"""
+packlist and songlist parsers
+"""
+
+import json
+from typing import List, Union
+
+from arcaea_offline.constants.enums import (
+    ArcaeaLanguage,
+    ArcaeaRatingClass,
+    ArcaeaSongSide,
+)
+from arcaea_offline.database.models.v5 import (
+    Difficulty,
+    DifficultyLocalized,
+    Pack,
+    PackLocalized,
+    Song,
+    SongLocalized,
+    SongSearchWord,
+)
+
+
+class ArcaeaListParser:
+    def __init__(self, list_text: str):
+        self.list_text = list_text
+
+
+class PacklistParser(ArcaeaListParser):
+    def parse(self) -> List[Union[Pack, PackLocalized]]:
+        root = json.loads(self.list_text)
+
+        packs = root["packs"]
+        results: List[Union[Pack, PackLocalized]] = [
+            Pack(id="single", name="Memory Archive")
+        ]
+        for item in packs:
+            pack = Pack()
+            pack.id = item["id"]
+            pack.name = item["name_localized"]["en"]
+            pack.description = item["description_localized"]["en"] or None
+            results.append(pack)
+
+            for key in ArcaeaLanguage:
+                name_localized = item["name_localized"].get(key.value, None)
+                description_localized = item["description_localized"].get(
+                    key.value, None
+                )
+
+                if name_localized or description_localized:
+                    pack_localized = PackLocalized(id=pack.id)
+                    pack_localized.lang = key.value
+                    pack_localized.name = name_localized
+                    pack_localized.description = description_localized
+                    results.append(pack_localized)
+
+        return results
+
+
+class SonglistParser(ArcaeaListParser):
+    def parse_songs(self) -> List[Union[Song, SongLocalized, SongSearchWord]]:
+        root = json.loads(self.list_text)
+
+        songs = root["songs"]
+        results = []
+        for item in songs:
+            song = Song()
+            song.idx = item["idx"]
+            song.id = item["id"]
+            song.title = item["title_localized"]["en"]
+            song.artist = item["artist"]
+            song.bpm = item["bpm"]
+            song.bpm_base = item["bpm_base"]
+            song.pack_id = item["set"]
+            song.audio_preview = item["audioPreview"]
+            song.audio_preview_end = item["audioPreviewEnd"]
+            song.side = ArcaeaSongSide(item["side"])
+            song.version = item["version"]
+            song.date = item["date"]
+            song.bg = item.get("bg")
+            song.bg_inverse = item.get("bg_inverse")
+            if item.get("bg_daynight"):
+                song.bg_day = item["bg_daynight"].get("day")
+                song.bg_night = item["bg_daynight"].get("night")
+            if item.get("source_localized"):
+                song.source = item["source_localized"]["en"]
+            song.source_copyright = item.get("source_copyright")
+            results.append(song)
+
+            for lang in ArcaeaLanguage:
+                # SongLocalized objects
+                title_localized = item["title_localized"].get(lang.value, None)
+                source_localized = item.get("source_localized", {}).get(
+                    lang.value, None
+                )
+
+                if title_localized or source_localized:
+                    song_localized = SongLocalized(id=song.id)
+                    song_localized.lang = lang.value
+                    song_localized.title = title_localized
+                    song_localized.source = source_localized
+                    results.append(song_localized)
+
+                # SongSearchTitle
+                search_titles = item.get("search_title", {}).get(lang.value, None)
+                if search_titles:
+                    for search_title in search_titles:
+                        song_search_word = SongSearchWord(
+                            id=song.id, lang=lang.value, type=1, value=search_title
+                        )
+                        results.append(song_search_word)
+
+                search_artists = item.get("search_artist", {}).get(lang.value, None)
+                if search_artists:
+                    for search_artist in search_artists:
+                        song_search_word = SongSearchWord(
+                            id=song.id, lang=lang.value, type=2, value=search_artist
+                        )
+                        results.append(song_search_word)
+
+        return results
+
+    def parse_difficulties(self) -> List[Union[Difficulty, DifficultyLocalized]]:
+        root = json.loads(self.list_text)
+
+        songs = root["songs"]
+        results = []
+        for song in songs:
+            difficulties = song.get("difficulties")
+            if not difficulties:
+                continue
+
+            for item in difficulties:
+                if item["rating"] == 0:
+                    continue
+
+                difficulty = Difficulty()
+                difficulty.song_id = song["id"]
+                difficulty.rating_class = ArcaeaRatingClass(item["ratingClass"])
+                difficulty.rating = item["rating"]
+                difficulty.rating_plus = item.get("ratingPlus") or False
+                difficulty.chart_designer = item["chartDesigner"]
+                difficulty.jacket_desginer = item.get("jacketDesigner") or None
+                difficulty.audio_override = item.get("audioOverride") or False
+                difficulty.jacket_override = item.get("jacketOverride") or False
+                difficulty.jacket_night = item.get("jacketNight") or None
+                difficulty.title = item.get("title_localized", {}).get("en") or None
+                difficulty.artist = item.get("artist") or None
+                difficulty.bg = item.get("bg") or None
+                difficulty.bg_inverse = item.get("bg_inverse")
+                difficulty.bpm = item.get("bpm") or None
+                difficulty.bpm_base = item.get("bpm_base") or None
+                difficulty.version = item.get("version") or None
+                difficulty.date = item.get("date") or None
+                results.append(difficulty)
+
+                for lang in ArcaeaLanguage:
+                    title_localized = item.get("title_localized", {}).get(
+                        lang.value, None
+                    )
+                    artist_localized = item.get("artist_localized", {}).get(
+                        lang.value, None
+                    )
+
+                    if title_localized or artist_localized:
+                        difficulty_localized = DifficultyLocalized(
+                            song_id=difficulty.song_id,
+                            rating_class=difficulty.rating_class,
+                        )
+                        difficulty_localized.lang = lang.value
+                        difficulty_localized.title = title_localized
+                        difficulty_localized.artist = artist_localized
+                        results.append(difficulty_localized)
+
+        return results
+
+    def parse_all(self):
+        return self.parse_songs() + self.parse_difficulties()

src/arcaea_offline/external/smartrte/__init__.py

@@ -1 +1,3 @@
 from .b30_csv import SmartRteB30CsvConverter
+
+__all__ = ["SmartRteB30CsvConverter"]

src/arcaea_offline/utils/formatters/__init__.py

@@ -1,2 +1,7 @@
 from .play_result import PlayResultFormatter
 from .rating_class import RatingClassFormatter
+
+__all__ = [
+    "PlayResultFormatter",
+    "RatingClassFormatter",
+]

tests/conftest.py

@@ -1,27 +1,53 @@
 import pytest
-from sqlalchemy import create_engine
+from sqlalchemy import create_engine, text
 from sqlalchemy.orm import sessionmaker
 
 # region sqlalchemy fixtures
-# from https://medium.com/@vittorio.camisa/agile-database-integration-tests-with-python-sqlalchemy-and-factory-boy-6824e8fe33a1
 engine = create_engine("sqlite:///:memory:")
 Session = sessionmaker()
 
 
-@pytest.fixture(scope="module")
+@pytest.fixture(scope="session")
 def db_conn():
-    connection = engine.connect()
-    yield connection
-    connection.close()
+    conn = engine.connect()
+    yield conn
+    conn.close()
 
 
-@pytest.fixture(scope="function")
+@pytest.fixture()
 def db_session(db_conn):
-    transaction = db_conn.begin()
     session = Session(bind=db_conn)
     yield session
     session.close()
-    transaction.rollback()
+
+    # drop everything
+    query_tables = db_conn.execute(
+        text("SELECT name FROM sqlite_master WHERE type='table'")
+    ).fetchall()
+    for row in query_tables:
+        table_name = row[0]
+        db_conn.execute(text(f"DROP TABLE {table_name}"))
+
+    query_views = db_conn.execute(
+        text("SELECT name FROM sqlite_master WHERE type='view'")
+    ).fetchall()
+    for row in query_views:
+        view_name = row[0]
+        db_conn.execute(text(f"DROP VIEW {view_name}"))
+
+    query_indexes = db_conn.execute(
+        text("SELECT name FROM sqlite_master WHERE type='index'")
+    ).fetchall()
+    for row in query_indexes:
+        index_name = row[0]
+        db_conn.execute(text(f"DROP INDEX {index_name}"))
+
+    query_triggers = db_conn.execute(
+        text("SELECT name FROM sqlite_master WHERE type='trigger'")
+    ).fetchall()
+    for row in query_triggers:
+        trigger_name = row[0]
+        db_conn.execute(text(f"DROP TRIGGER {trigger_name}"))
 
 
 # endregion

tests/db/db.py

@@ -1,5 +0,0 @@
-from sqlalchemy import Engine, create_engine, inspect
-
-
-def create_engine_in_memory():
-    return create_engine("sqlite:///:memory:")

tests/db/models/test_custom_types.py

@@ -41,7 +41,7 @@ class TestCustomTypes:
                 )
             ).one()[0]
 
-        TestBase.metadata.create_all(db_session.bind)
+        TestBase.metadata.create_all(db_session.bind, checkfirst=False)
 
         basic_obj = IntEnumTestModel(id=1, value=TestIntEnum.TWO)
         null_obj = IntEnumTestModel(id=2, value=None)
@@ -53,7 +53,7 @@ class TestCustomTypes:
         assert _query_value(2) is None
 
     def test_tz_datetime(self, db_session):
-        TestBase.metadata.create_all(db_session.bind)
+        TestBase.metadata.create_all(db_session.bind, checkfirst=False)
 
         dt1 = datetime.now(tz=timezone(timedelta(hours=8)))
 

tests/db/models/test_songs.py

@@ -1,118 +0,0 @@
-from sqlalchemy import Engine
-from sqlalchemy.orm import Session
-
-from arcaea_offline.models.songs import (
-    Chart,
-    ChartInfo,
-    Difficulty,
-    Pack,
-    Song,
-    SongsBase,
-    SongsViewBase,
-)
-
-from ..db import create_engine_in_memory
-
-
-def _song(**kw):
-    defaults = {"artist": "test"}
-    defaults.update(kw)
-    return Song(**defaults)
-
-
-def _difficulty(**kw):
-    defaults = {"rating_plus": False, "audio_override": False, "jacket_override": False}
-    defaults.update(kw)
-    return Difficulty(**defaults)
-
-
-class Test_Chart:
-    def init_db(self, engine: Engine):
-        SongsBase.metadata.create_all(engine)
-        SongsViewBase.metadata.create_all(engine)
-
-    def db(self):
-        db = create_engine_in_memory()
-        self.init_db(db)
-        return db
-
-    def test_chart_info(self):
-        pre_entites = [
-            Pack(id="test", name="Test Pack"),
-            _song(idx=0, id="song0", set="test", title="Full Chart Info"),
-            _song(idx=1, id="song1", set="test", title="Partial Chart Info"),
-            _song(idx=2, id="song2", set="test", title="No Chart Info"),
-            _difficulty(song_id="song0", rating_class=2, rating=9),
-            _difficulty(song_id="song1", rating_class=2, rating=9),
-            _difficulty(song_id="song2", rating_class=2, rating=9),
-            ChartInfo(song_id="song0", rating_class=2, constant=90, notes=1234),
-            ChartInfo(song_id="song1", rating_class=2, constant=90),
-        ]
-
-        db = self.db()
-        with Session(db) as session:
-            session.add_all(pre_entites)
-            session.commit()
-
-            chart_song0_ratingclass2 = (
-                session.query(Chart)
-                .where((Chart.song_id == "song0") & (Chart.rating_class == 2))
-                .one()
-            )
-
-            assert chart_song0_ratingclass2.constant == 90
-            assert chart_song0_ratingclass2.notes == 1234
-
-            chart_song1_ratingclass2 = (
-                session.query(Chart)
-                .where((Chart.song_id == "song1") & (Chart.rating_class == 2))
-                .one()
-            )
-
-            assert chart_song1_ratingclass2.constant == 90
-            assert chart_song1_ratingclass2.notes is None
-
-            chart_song2_ratingclass2 = (
-                session.query(Chart)
-                .where((Chart.song_id == "song2") & (Chart.rating_class == 2))
-                .first()
-            )
-
-            assert chart_song2_ratingclass2 is None
-
-    def test_difficulty_title_override(self):
-        pre_entites = [
-            Pack(id="test", name="Test Pack"),
-            _song(idx=0, id="test", set="test", title="Test"),
-            _difficulty(song_id="test", rating_class=0, rating=2),
-            _difficulty(song_id="test", rating_class=1, rating=5),
-            _difficulty(song_id="test", rating_class=2, rating=8),
-            _difficulty(
-                song_id="test", rating_class=3, rating=10, title="TEST ~REVIVE~"
-            ),
-            ChartInfo(song_id="test", rating_class=0, constant=10),
-            ChartInfo(song_id="test", rating_class=1, constant=10),
-            ChartInfo(song_id="test", rating_class=2, constant=10),
-            ChartInfo(song_id="test", rating_class=3, constant=10),
-        ]
-
-        db = self.db()
-        with Session(db) as session:
-            session.add_all(pre_entites)
-            session.commit()
-
-            charts_original_title = (
-                session.query(Chart)
-                .where((Chart.song_id == "test") & (Chart.rating_class in [0, 1, 2]))
-                .all()
-            )
-
-            assert all(chart.title == "Test" for chart in charts_original_title)
-
-            chart_overrided_title = (
-                session.query(Chart)
-                .where((Chart.song_id == "test") & (Chart.rating_class == 3))
-                .one()
-            )
-
-            assert chart_overrided_title.title == "TEST ~REVIVE~"

tests/db/models/v4/test_songs.py

@@ -0,0 +1,108 @@
+from arcaea_offline.database.models.v4.songs import (
+    Chart,
+    ChartInfo,
+    Difficulty,
+    Pack,
+    Song,
+    SongsBase,
+    SongsViewBase,
+)
+
+
+def _song(**kw):
+    defaults = {"artist": "test"}
+    defaults.update(kw)
+    return Song(**defaults)
+
+
+def _difficulty(**kw):
+    defaults = {"rating_plus": False, "audio_override": False, "jacket_override": False}
+    defaults.update(kw)
+    return Difficulty(**defaults)
+
+
+class Test_Chart:
+    def init_db(self, session):
+        SongsBase.metadata.create_all(session.bind, checkfirst=False)
+        SongsViewBase.metadata.create_all(session.bind, checkfirst=False)
+
+    def test_chart_info(self, db_session):
+        self.init_db(db_session)
+
+        pre_entites = [
+            Pack(id="test", name="Test Pack"),
+            _song(idx=0, id="song0", set="test", title="Full Chart Info"),
+            _song(idx=1, id="song1", set="test", title="Partial Chart Info"),
+            _song(idx=2, id="song2", set="test", title="No Chart Info"),
+            _difficulty(song_id="song0", rating_class=2, rating=9),
+            _difficulty(song_id="song1", rating_class=2, rating=9),
+            _difficulty(song_id="song2", rating_class=2, rating=9),
+            ChartInfo(song_id="song0", rating_class=2, constant=90, notes=1234),
+            ChartInfo(song_id="song1", rating_class=2, constant=90),
+        ]
+
+        db_session.add_all(pre_entites)
+        db_session.commit()
+
+        chart_song0_ratingclass2 = (
+            db_session.query(Chart)
+            .where((Chart.song_id == "song0") & (Chart.rating_class == 2))
+            .one()
+        )
+
+        assert chart_song0_ratingclass2.constant == 90
+        assert chart_song0_ratingclass2.notes == 1234
+
+        chart_song1_ratingclass2 = (
+            db_session.query(Chart)
+            .where((Chart.song_id == "song1") & (Chart.rating_class == 2))
+            .one()
+        )
+
+        assert chart_song1_ratingclass2.constant == 90
+        assert chart_song1_ratingclass2.notes is None
+
+        chart_song2_ratingclass2 = (
+            db_session.query(Chart)
+            .where((Chart.song_id == "song2") & (Chart.rating_class == 2))
+            .first()
+        )
+
+        assert chart_song2_ratingclass2 is None
+
+    def test_difficulty_title_override(self, db_session):
+        self.init_db(db_session)
+
+        pre_entites = [
+            Pack(id="test", name="Test Pack"),
+            _song(idx=0, id="test", set="test", title="Test"),
+            _difficulty(song_id="test", rating_class=0, rating=2),
+            _difficulty(song_id="test", rating_class=1, rating=5),
+            _difficulty(song_id="test", rating_class=2, rating=8),
+            _difficulty(
+                song_id="test", rating_class=3, rating=10, title="TEST ~REVIVE~"
+            ),
+            ChartInfo(song_id="test", rating_class=0, constant=10),
+            ChartInfo(song_id="test", rating_class=1, constant=10),
+            ChartInfo(song_id="test", rating_class=2, constant=10),
+            ChartInfo(song_id="test", rating_class=3, constant=10),
+        ]
+
+        db_session.add_all(pre_entites)
+        db_session.commit()
+
+        charts_original_title = (
+            db_session.query(Chart)
+            .where((Chart.song_id == "test") & (Chart.rating_class in [0, 1, 2]))
+            .all()
+        )
+
+        assert all(chart.title == "Test" for chart in charts_original_title)
+
+        chart_overrided_title = (
+            db_session.query(Chart)
+            .where((Chart.song_id == "test") & (Chart.rating_class == 3))
+            .one()
+        )
+
+        assert chart_overrided_title.title == "TEST ~REVIVE~"

tests/db/models/v5/relationships/test_common.py

@@ -0,0 +1,143 @@
+"""
+Database model v5 common relationships
+
+┌──────┐   ┌──────┐   ┌────────────┐   ┌────────────┐
+│ Pack ◄───► Song ◄───► Difficulty ◄───┤ PlayResult │
+└──────┘   └──┬───┘   └─────▲──────┘   └────────────┘
+              │             │
+              │       ┌─────▼─────┐
+              └───────► ChartInfo │
+                      └───────────┘
+"""
+
+from arcaea_offline.constants.enums import ArcaeaRatingClass
+from arcaea_offline.database.models.v5 import (
+    ChartInfo,
+    Difficulty,
+    ModelsV5Base,
+    Pack,
+    PlayResult,
+    Song,
+)
+
+
+class TestSongRelationships:
+    @staticmethod
+    def init_db(session):
+        ModelsV5Base.metadata.create_all(session.bind)
+
+    def test_relationships(self, db_session):
+        self.init_db(db_session)
+
+        song_id = "test_song"
+        title_en = "Test Lorem Ipsum"
+        artist_en = "Test Artist"
+
+        pack = Pack(
+            id="test_pack",
+            name="Test Pack",
+            description="This is a test pack.",
+        )
+
+        song = Song(
+            idx=1,
+            id=song_id,
+            title=title_en,
+            artist=artist_en,
+            pack_id=pack.id,
+        )
+
+        difficulty_pst = Difficulty(
+            song_id=song.id,
+            rating_class=ArcaeaRatingClass.PAST,
+            rating=2,
+            rating_plus=False,
+        )
+        chart_info_pst = ChartInfo(
+            song_id=song.id,
+            rating_class=ArcaeaRatingClass.PAST,
+            constant=20,
+            notes=200,
+        )
+
+        difficulty_prs = Difficulty(
+            song_id=song.id,
+            rating_class=ArcaeaRatingClass.PRESENT,
+            rating=7,
+            rating_plus=True,
+        )
+        chart_info_prs = ChartInfo(
+            song_id=song.id,
+            rating_class=ArcaeaRatingClass.PRESENT,
+            constant=78,
+            notes=780,
+        )
+
+        difficulty_ftr = Difficulty(
+            song_id=song.id,
+            rating_class=ArcaeaRatingClass.FUTURE,
+            rating=10,
+            rating_plus=True,
+        )
+        chart_info_ftr = ChartInfo(
+            song_id=song.id,
+            rating_class=ArcaeaRatingClass.FUTURE,
+            constant=109,
+            notes=1090,
+        )
+
+        difficulty_etr = Difficulty(
+            song_id=song.id,
+            rating_class=ArcaeaRatingClass.ETERNAL,
+            rating=9,
+            rating_plus=True,
+        )
+
+        play_result_ftr = PlayResult(
+            song_id=song.id,
+            rating_class=ArcaeaRatingClass.FUTURE,
+            score=123456,
+        )
+
+        db_session.add_all(
+            [
+                pack,
+                song,
+                difficulty_pst,
+                chart_info_pst,
+                difficulty_prs,
+                chart_info_prs,
+                difficulty_ftr,
+                chart_info_ftr,
+                difficulty_etr,
+                play_result_ftr,
+            ]
+        )
+        db_session.commit()
+
+        assert pack.songs == [song]
+
+        assert song.pack == pack
+        assert song.difficulties == [
+            difficulty_pst,
+            difficulty_prs,
+            difficulty_ftr,
+            difficulty_etr,
+        ]
+        assert song.charts_info == [chart_info_pst, chart_info_prs, chart_info_ftr]
+
+        assert difficulty_pst.song == song
+        assert difficulty_prs.song == song
+        assert difficulty_ftr.song == song
+        assert difficulty_etr.song == song
+
+        assert difficulty_pst.chart_info == chart_info_pst
+        assert difficulty_prs.chart_info == chart_info_prs
+        assert difficulty_ftr.chart_info == chart_info_ftr
+        assert difficulty_etr.chart_info is None
+
+        assert chart_info_pst.difficulty == difficulty_pst
+        assert chart_info_prs.difficulty == difficulty_prs
+        assert chart_info_ftr.difficulty == difficulty_ftr
+
+        assert play_result_ftr.difficulty == difficulty_ftr

tests/db/models/v5/relationships/test_pack.py

@@ -0,0 +1,69 @@
+"""
+Database model v5 relationships
+
+Pack <> PackLocalized
+"""
+
+from arcaea_offline.constants.enums import ArcaeaLanguage
+from arcaea_offline.database.models.v5 import ModelsV5Base, Pack, PackLocalized
+
+
+class TestPackRelationships:
+    @staticmethod
+    def init_db(session):
+        ModelsV5Base.metadata.create_all(session.bind)
+
+    def test_localized_objects(self, db_session):
+        self.init_db(db_session)
+
+        pack_id = "test_pack"
+        name_en = "Test Pack"
+        description_en = "Travel through common database models\nfrom the unpopular framework 'Arcaea Offline'\ntogether with an ordinary partner '∅'."
+
+        pack = Pack(
+            id=pack_id,
+            name=name_en,
+            description=description_en,
+        )
+
+        pkid_ja = 1
+        description_ja = "普通のパートナー「∅」と一緒に、\n不人気フレームワーク「Arcaea Offline」より、\n一般的なデータベース・モデルを通過する。"
+        pack_localized_ja = PackLocalized(
+            pkid=pkid_ja,
+            id=pack_id,
+            lang=ArcaeaLanguage.JA.value,
+            name=None,
+            description=description_ja,
+        )
+
+        pkid_zh_hans = 2
+        description_zh_hans = "与平凡的「∅」一起，\n在没人用的「Arcaea Offline」框架里，\n一同探索随处可见的数据库模型。"
+        pack_localized_zh_hans = PackLocalized(
+            pkid=pkid_zh_hans,
+            id=pack_id,
+            lang=ArcaeaLanguage.ZH_HANS.value,
+            name=None,
+            description=description_zh_hans,
+        )
+
+        db_session.add_all([pack, pack_localized_ja])
+        db_session.commit()
+
+        assert len(pack.localized_objects) == len([pack_localized_ja])
+
+        assert pack_localized_ja.parent.description == pack.description
+
+        # relationships should be viewonly
+        new_pack = Pack(
+            id=f"{pack_id}_new",
+            name="NEW",
+            description="new new pack",
+        )
+        db_session.add(new_pack)
+
+        pack_localized_ja.parent = new_pack
+        pack.localized_objects.append(pack_localized_zh_hans)
+        db_session.commit()
+
+        assert pack_localized_ja.parent == pack
+        assert len(pack.localized_objects) == 1

tests/db/models/v5/test_chart.py

@@ -0,0 +1,110 @@
+"""
+Database models v5
+
+Chart functionalities
+- basic data handling
+- Difficulty song info overriding
+"""
+
+from arcaea_offline.constants.enums.arcaea import ArcaeaRatingClass
+from arcaea_offline.database.models.v5 import (
+    Chart,
+    ChartInfo,
+    Difficulty,
+    ModelsV5Base,
+    ModelsV5ViewBase,
+    Pack,
+    Song,
+)
+
+
+class TestChart:
+    def init_db(self, session):
+        ModelsV5Base.metadata.create_all(session.bind)
+        ModelsV5ViewBase.metadata.create_all(session.bind)
+
+    def test_basic(self, db_session):
+        self.init_db(db_session)
+
+        pack_id = "test_pack"
+        song_id = "test_song"
+        rating_class = ArcaeaRatingClass.FUTURE
+
+        pack = Pack(id=pack_id, name="Test Pack")
+        song = Song(
+            idx=2,
+            id=song_id,
+            title="~TEST~",
+            artist="~test~",
+            pack_id=pack_id,
+        )
+        difficulty = Difficulty(
+            song_id=song_id,
+            rating_class=rating_class,
+            rating=9,
+            rating_plus=True,
+        )
+        chart_info = ChartInfo(
+            song_id=song_id,
+            rating_class=rating_class,
+            constant=98,
+            notes=980,
+        )
+        db_session.add_all([pack, song, difficulty, chart_info])
+
+        chart: Chart = (
+            db_session.query(Chart)
+            .where((Chart.song_id == song_id) & (Chart.rating_class == rating_class))
+            .one()
+        )
+
+        # `song_id` and `rating_class` are guarded by the WHERE clause above
+        assert chart.song_idx == song.idx
+        assert chart.title == song.title
+        assert chart.artist == song.artist
+        assert chart.pack_id == song.pack_id
+        assert chart.rating == difficulty.rating
+        assert chart.rating_plus == difficulty.rating_plus
+        assert chart.constant == chart_info.constant
+        assert chart.notes == chart_info.notes
+
+    def test_difficulty_override(self, db_session):
+        self.init_db(db_session)
+
+        pack_id = "test_pack"
+        song_id = "test_song"
+        rating_class = ArcaeaRatingClass.FUTURE
+
+        pack = Pack(id=pack_id, name="Test Pack")
+        song = Song(
+            idx=2,
+            id=song_id,
+            title="~TEST~",
+            artist="~test~",
+            pack_id=pack_id,
+        )
+        difficulty = Difficulty(
+            song_id=song_id,
+            rating_class=rating_class,
+            rating=9,
+            rating_plus=True,
+            title="~TEST DIFF~",
+            artist="~diff~",
+        )
+        chart_info = ChartInfo(
+            song_id=song_id,
+            rating_class=rating_class,
+            constant=98,
+            notes=980,
+        )
+        db_session.add_all([pack, song, difficulty, chart_info])
+
+        chart: Chart = (
+            db_session.query(Chart)
+            .where((Chart.song_id == song_id) & (Chart.rating_class == rating_class))
+            .one()
+        )
+
+        assert chart.song_idx == song.idx
+        assert chart.title == difficulty.title
+        assert chart.artist == difficulty.artist