diff --git a/app/database/achievement.py b/app/database/achievement.py
new file mode 100644
index 0000000..4be587f
--- /dev/null
+++ b/app/database/achievement.py
@@ -0,0 +1,40 @@
+from datetime import UTC, datetime
+from typing import TYPE_CHECKING
+
+from app.models.model import UTCBaseModel
+
+from sqlmodel import (
+    BigInteger,
+    Column,
+    DateTime,
+    Field,
+    ForeignKey,
+    Relationship,
+    SQLModel,
+)
+
+if TYPE_CHECKING:
+    from .lazer_user import User
+
+
+class UserAchievementBase(SQLModel, UTCBaseModel):
+    achievement_id: int = Field(primary_key=True)
+    achieved_at: datetime = Field(
+        default=datetime.now(UTC), sa_column=Column(DateTime(timezone=True))
+    )
+
+
+class UserAchievement(UserAchievementBase, table=True):
+    __tablename__ = "lazer_user_achievements"  # pyright: ignore[reportAssignmentType]
+
+    id: int | None = Field(default=None, primary_key=True, index=True)
+    user_id: int = Field(
+        sa_column=Column(BigInteger, ForeignKey("lazer_users.id")), exclude=True
+    )
+    user: "User" = Relationship(back_populates="achievement")
+
+
+class UserAchievementResp(UserAchievementBase):
+    @classmethod
+    def from_db(cls, db_model: UserAchievement) -> "UserAchievementResp":
+        return cls.model_validate(db_model)
diff --git a/app/database/daily_challenge.py b/app/database/daily_challenge.py
new file mode 100644
index 0000000..abf874f
--- /dev/null
+++ b/app/database/daily_challenge.py
@@ -0,0 +1,58 @@
+from datetime import datetime
+from typing import TYPE_CHECKING
+
+from app.models.model import UTCBaseModel
+
+from sqlmodel import (
+    BigInteger,
+    Column,
+    DateTime,
+    Field,
+    ForeignKey,
+    Relationship,
+    SQLModel,
+)
+
+if TYPE_CHECKING:
+    from .lazer_user import User
+
+
+class DailyChallengeStatsBase(SQLModel, UTCBaseModel):
+    daily_streak_best: int = Field(default=0)
+    daily_streak_current: int = Field(default=0)
+    last_update: datetime | None = Field(default=None, sa_column=Column(DateTime))
+    last_weekly_streak: datetime | None = Field(
+        default=None, sa_column=Column(DateTime)
+    )
+    playcount: int = Field(default=0)
+    top_10p_placements: int = Field(default=0)
+    top_50p_placements: int = Field(default=0)
+    weekly_streak_best: int = Field(default=0)
+    weekly_streak_current: int = Field(default=0)
+
+
+class DailyChallengeStats(DailyChallengeStatsBase, table=True):
+    __tablename__ = "daily_challenge_stats"  # pyright: ignore[reportAssignmentType]
+
+    user_id: int | None = Field(
+        default=None,
+        sa_column=Column(
+            BigInteger,
+            ForeignKey("lazer_users.id"),
+            unique=True,
+            index=True,
+            primary_key=True,
+        ),
+    )
+    user: "User" = Relationship(back_populates="daily_challenge_stats")
+
+
+class DailyChallengeStatsResp(DailyChallengeStatsBase):
+    user_id: int
+
+    @classmethod
+    def from_db(
+        cls,
+        obj: DailyChallengeStats,
+    ) -> "DailyChallengeStatsResp":
+        return cls.model_validate(obj)
diff --git a/app/database/lazer_user.py b/app/database/lazer_user.py
new file mode 100644
index 0000000..9b98c98
--- /dev/null
+++ b/app/database/lazer_user.py
@@ -0,0 +1,330 @@
+from datetime import UTC, datetime
+from typing import TYPE_CHECKING, NotRequired, TypedDict
+
+from app.models.model import UTCBaseModel
+from app.models.score import GameMode
+from app.models.user import Country, Page, RankHistory
+
+from .achievement import UserAchievement, UserAchievementResp
+from .daily_challenge import DailyChallengeStats, DailyChallengeStatsResp
+from .monthly_playcounts import MonthlyPlaycounts, MonthlyPlaycountsResp
+from .statistics import UserStatistics, UserStatisticsResp
+from .team import Team, TeamMember
+from .user_account_history import UserAccountHistory, UserAccountHistoryResp
+
+from sqlalchemy.orm import joinedload, selectinload
+from sqlmodel import (
+    JSON,
+    BigInteger,
+    Column,
+    DateTime,
+    Field,
+    Relationship,
+    SQLModel,
+    func,
+    select,
+)
+from sqlmodel.ext.asyncio.session import AsyncSession
+
+if TYPE_CHECKING:
+    from app.database.relationship import RelationshipResp
+
+
+class Kudosu(TypedDict):
+    available: int
+    total: int
+
+
+class RankHighest(TypedDict):
+    rank: int
+    updated_at: datetime
+
+
+class UserProfileCover(TypedDict):
+    url: str
+    custom_url: NotRequired[str]
+    id: NotRequired[str]
+
+
+Badge = TypedDict(
+    "Badge",
+    {
+        "awarded_at": datetime,
+        "description": str,
+        "image@2x_url": str,
+        "image_url": str,
+        "url": str,
+    },
+)
+
+
+class UserBase(UTCBaseModel, SQLModel):
+    avatar_url: str = ""
+    country_code: str = Field(default="CN", max_length=2, index=True)
+    # ? default_group: str|None
+    is_active: bool = True
+    is_bot: bool = False
+    is_supporter: bool = False
+    last_visit: datetime = Field(
+        default=datetime.now(UTC), sa_column=Column(DateTime(timezone=True))
+    )
+    pm_friends_only: bool = False
+    profile_colour: str | None = None
+    username: str = Field(max_length=32, unique=True, index=True)
+    page: Page = Field(sa_column=Column(JSON), default=Page(html="", raw=""))
+    previous_usernames: list[str] = Field(default_factory=list, sa_column=Column(JSON))
+    # TODO: replays_watched_counts
+    support_level: int = 0
+    badges: list[Badge] = Field(default_factory=list, sa_column=Column(JSON))
+
+    # optional
+    is_restricted: bool = False
+    # blocks
+    cover: UserProfileCover = Field(
+        default=UserProfileCover(
+            url="https://assets.ppy.sh/user-profile-covers/default.jpeg"
+        ),
+        sa_column=Column(JSON),
+    )
+    beatmap_playcounts_count: int = 0
+    # kudosu
+
+    # UserExtended
+    playmode: GameMode = GameMode.OSU
+    discord: str | None = None
+    has_supported: bool = False
+    interests: str | None = None
+    join_date: datetime = Field(default=datetime.now(UTC))
+    location: str | None = None
+    max_blocks: int = 50
+    max_friends: int = 500
+    occupation: str | None = None
+    playstyle: list[str] = Field(default_factory=list, sa_column=Column(JSON))
+    # TODO: post_count
+    profile_hue: int | None = None
+    profile_order: list[str] = Field(
+        default_factory=lambda: [
+            "me",
+            "recent_activity",
+            "top_ranks",
+            "medals",
+            "historical",
+            "beatmaps",
+            "kudosu",
+        ],
+        sa_column=Column(JSON),
+    )
+    title: str | None = None
+    title_url: str | None = None
+    twitter: str | None = None
+    website: str | None = None
+
+    # undocumented
+    comments_count: int = 0
+    post_count: int = 0
+    is_admin: bool = False
+    is_gmt: bool = False
+    is_qat: bool = False
+    is_bng: bool = False
+
+
+class User(UserBase, table=True):
+    __tablename__ = "lazer_users"  # pyright: ignore[reportAssignmentType]
+
+    id: int | None = Field(
+        default=None,
+        sa_column=Column(BigInteger, primary_key=True, autoincrement=True, index=True),
+    )
+    account_history: list[UserAccountHistory] = Relationship()
+    statistics: list[UserStatistics] = Relationship()
+    achievement: list[UserAchievement] = Relationship(back_populates="user")
+    team_membership: TeamMember | None = Relationship(back_populates="user")
+    daily_challenge_stats: DailyChallengeStats | None = Relationship(
+        back_populates="user"
+    )
+    monthly_playcounts: list[MonthlyPlaycounts] = Relationship(back_populates="user")
+
+    email: str = Field(max_length=254, unique=True, index=True, exclude=True)
+    priv: int = Field(default=1, exclude=True)
+    pw_bcrypt: str = Field(max_length=60, exclude=True)
+    silence_end_at: datetime | None = Field(
+        default=None, sa_column=Column(DateTime(timezone=True)), exclude=True
+    )
+    donor_end_at: datetime | None = Field(
+        default=None, sa_column=Column(DateTime(timezone=True)), exclude=True
+    )
+
+    @classmethod
+    def all_select_option(cls):
+        return (
+            selectinload(cls.account_history),  # pyright: ignore[reportArgumentType]
+            selectinload(cls.statistics),  # pyright: ignore[reportArgumentType]
+            selectinload(cls.achievement),  # pyright: ignore[reportArgumentType]
+            joinedload(cls.team_membership).joinedload(TeamMember.team),  # pyright: ignore[reportArgumentType]
+            joinedload(cls.daily_challenge_stats),  # pyright: ignore[reportArgumentType]
+            selectinload(cls.monthly_playcounts),  # pyright: ignore[reportArgumentType]
+        )
+
+
+class UserResp(UserBase):
+    id: int | None = None
+    is_online: bool = True  # TODO
+    groups: list = []  # TODO
+    country: Country = Field(default_factory=lambda: Country(code="CN", name="China"))
+    favourite_beatmapset_count: int = 0  # TODO
+    graveyard_beatmapset_count: int = 0  # TODO
+    guest_beatmapset_count: int = 0  # TODO
+    loved_beatmapset_count: int = 0  # TODO
+    mapping_follower_count: int = 0  # TODO
+    nominated_beatmapset_count: int = 0  # TODO
+    pending_beatmapset_count: int = 0  # TODO
+    ranked_beatmapset_count: int = 0  # TODO
+    follow_user_mapping: list[int] = Field(default_factory=list)
+    follower_count: int = 0
+    friends: list["RelationshipResp"] | None = None
+    scores_best_count: int = 0
+    scores_first_count: int = 0
+    scores_recent_count: int = 0
+    scores_pinned_count: int = 0
+    account_history: list[UserAccountHistoryResp] = []
+    active_tournament_banners: list[dict] = []  # TODO
+    kudosu: Kudosu = Field(default_factory=lambda: Kudosu(available=0, total=0))  # TODO
+    monthly_playcounts: list[MonthlyPlaycountsResp] = Field(default_factory=list)
+    unread_pm_count: int = 0  # TODO
+    rank_history: RankHistory | None = None  # TODO
+    rank_highest: RankHighest | None = None  # TODO
+    statistics: UserStatisticsResp | None = None
+    statistics_rulesets: dict[str, UserStatisticsResp] | None = None
+    user_achievements: list[UserAchievementResp] = Field(default_factory=list)
+    cover_url: str = ""  # deprecated
+    team: Team | None = None
+    session_verified: bool = True
+    daily_challenge_user_stats: DailyChallengeStatsResp | None = None
+
+    # TODO: monthly_playcounts, unread_pm_count， rank_history, user_preferences
+
+    @classmethod
+    async def from_db(
+        cls,
+        obj: User,
+        session: AsyncSession,
+        include: list[str] = [],
+        ruleset: GameMode | None = None,
+    ) -> "UserResp":
+        from .best_score import BestScore
+        from .relationship import Relationship, RelationshipResp, RelationshipType
+
+        u = cls.model_validate(obj.model_dump())
+        u.id = obj.id
+        u.follower_count = (
+            await session.exec(
+                select(func.count())
+                .select_from(Relationship)
+                .where(
+                    Relationship.target_id == obj.id,
+                    Relationship.type == RelationshipType.FOLLOW,
+                )
+            )
+        ).one()
+        u.scores_best_count = (
+            await session.exec(
+                select(func.count())
+                .select_from(BestScore)
+                .where(
+                    BestScore.user_id == obj.id,
+                )
+                .limit(200)
+            )
+        ).one()
+        u.cover_url = (
+            obj.cover.get(
+                "url", "https://assets.ppy.sh/user-profile-covers/default.jpeg"
+            )
+            if obj.cover
+            else "https://assets.ppy.sh/user-profile-covers/default.jpeg"
+        )
+
+        if "friends" in include:
+            u.friends = [
+                await RelationshipResp.from_db(session, r)
+                for r in (
+                    await session.exec(
+                        select(Relationship)
+                        .options(
+                            joinedload(Relationship.target).options(  # pyright: ignore[reportArgumentType]
+                                *User.all_select_option()
+                            )
+                        )
+                        .where(
+                            Relationship.user_id == obj.id,
+                            Relationship.type == RelationshipType.FOLLOW,
+                        )
+                    )
+                ).all()
+            ]
+
+        if "team" in include:
+            if obj.team_membership:
+                u.team = obj.team_membership.team
+
+        if "account_history" in include:
+            u.account_history = [
+                UserAccountHistoryResp.from_db(ah) for ah in obj.account_history
+            ]
+
+        if "daily_challenge_user_stats":
+            if obj.daily_challenge_stats:
+                u.daily_challenge_user_stats = DailyChallengeStatsResp.from_db(
+                    obj.daily_challenge_stats
+                )
+
+        if "statistics" in include:
+            current_stattistics = None
+            for i in obj.statistics:
+                if i.mode == (ruleset or obj.playmode):
+                    current_stattistics = i
+                    break
+            u.statistics = (
+                UserStatisticsResp.from_db(current_stattistics)
+                if current_stattistics
+                else None
+            )
+
+        if "statistics_rulesets" in include:
+            u.statistics_rulesets = {
+                i.mode.value: UserStatisticsResp.from_db(i) for i in obj.statistics
+            }
+
+        if "monthly_playcounts" in include:
+            u.monthly_playcounts = [
+                MonthlyPlaycountsResp.from_db(pc) for pc in obj.monthly_playcounts
+            ]
+
+        if "achievements" in include:
+            u.user_achievements = [
+                UserAchievementResp.from_db(ua) for ua in obj.achievement
+            ]
+
+        return u
+
+
+ALL_INCLUDED = [
+    "friends",
+    "team",
+    "account_history",
+    "daily_challenge_user_stats",
+    "statistics",
+    "statistics_rulesets",
+    "achievements",
+    "monthly_playcounts",
+]
+
+
+SEARCH_INCLUDED = [
+    "team",
+    "daily_challenge_user_stats",
+    "statistics",
+    "statistics_rulesets",
+    "achievements",
+    "monthly_playcounts",
+]
diff --git a/app/database/monthly_playcounts.py b/app/database/monthly_playcounts.py
new file mode 100644
index 0000000..46192d1
--- /dev/null
+++ b/app/database/monthly_playcounts.py
@@ -0,0 +1,43 @@
+from datetime import date
+from typing import TYPE_CHECKING
+
+from sqlmodel import (
+    BigInteger,
+    Column,
+    Field,
+    ForeignKey,
+    Relationship,
+    SQLModel,
+)
+
+if TYPE_CHECKING:
+    from .lazer_user import User
+
+
+class MonthlyPlaycounts(SQLModel, table=True):
+    __tablename__ = "monthly_playcounts"  # pyright: ignore[reportAssignmentType]
+
+    id: int | None = Field(
+        default=None,
+        sa_column=Column(BigInteger, primary_key=True, autoincrement=True),
+    )
+    user_id: int = Field(
+        sa_column=Column(BigInteger, ForeignKey("lazer_users.id"), index=True)
+    )
+    year: int = Field(index=True)
+    month: int = Field(index=True)
+    playcount: int = Field(default=0)
+
+    user: "User" = Relationship(back_populates="monthly_playcounts")
+
+
+class MonthlyPlaycountsResp(SQLModel):
+    start_date: date
+    count: int
+
+    @classmethod
+    def from_db(cls, db_model: MonthlyPlaycounts) -> "MonthlyPlaycountsResp":
+        return cls(
+            start_date=date(db_model.year, db_model.month, 1),
+            count=db_model.playcount,
+        )
diff --git a/app/database/statistics.py b/app/database/statistics.py
new file mode 100644
index 0000000..cac2971
--- /dev/null
+++ b/app/database/statistics.py
@@ -0,0 +1,95 @@
+from typing import TYPE_CHECKING
+
+from app.models.score import GameMode
+
+from sqlmodel import (
+    BigInteger,
+    Column,
+    Field,
+    ForeignKey,
+    Relationship,
+    SQLModel,
+)
+
+if TYPE_CHECKING:
+    from .lazer_user import User
+
+
+class UserStatisticsBase(SQLModel):
+    mode: GameMode
+    count_100: int = Field(default=0, sa_column=Column(BigInteger))
+    count_300: int = Field(default=0, sa_column=Column(BigInteger))
+    count_50: int = Field(default=0, sa_column=Column(BigInteger))
+    count_miss: int = Field(default=0, sa_column=Column(BigInteger))
+
+    global_rank: int | None = Field(default=None)
+    country_rank: int | None = Field(default=None)
+
+    pp: float = Field(default=0.0)
+    ranked_score: int = Field(default=0)
+    hit_accuracy: float = Field(default=0.00)
+    total_score: int = Field(default=0, sa_column=Column(BigInteger))
+    total_hits: int = Field(default=0, sa_column=Column(BigInteger))
+    maximum_combo: int = Field(default=0)
+
+    play_count: int = Field(default=0)
+    play_time: int = Field(default=0, sa_column=Column(BigInteger))
+    replays_watched_by_others: int = Field(default=0)
+    is_ranked: bool = Field(default=True)
+
+
+class UserStatistics(UserStatisticsBase, table=True):
+    __tablename__ = "lazer_user_statistics"  # pyright: ignore[reportAssignmentType]
+    id: int | None = Field(default=None, primary_key=True)
+    user_id: int = Field(
+        default=None,
+        sa_column=Column(
+            BigInteger,
+            ForeignKey("lazer_users.id"),
+            index=True,
+        ),
+    )
+    grade_ss: int = Field(default=0)
+    grade_ssh: int = Field(default=0)
+    grade_s: int = Field(default=0)
+    grade_sh: int = Field(default=0)
+    grade_a: int = Field(default=0)
+
+    level_current: int = Field(default=1)
+    level_progress: int = Field(default=0)
+
+    user: "User" = Relationship(back_populates="statistics")  # type: ignore[valid-type]
+
+
+class UserStatisticsResp(UserStatisticsBase):
+    grade_counts: dict[str, int] = Field(
+        default_factory=lambda: {
+            "ss": 0,
+            "ssh": 0,
+            "s": 0,
+            "sh": 0,
+            "a": 0,
+        }
+    )
+    level: dict[str, int] = Field(
+        default_factory=lambda: {
+            "current": 1,
+            "progress": 0,
+        }
+    )
+
+    @classmethod
+    def from_db(cls, obj: UserStatistics) -> "UserStatisticsResp":
+        s = cls.model_validate(obj)
+        s.grade_counts = {
+            "ss": obj.grade_ss,
+            "ssh": obj.grade_ssh,
+            "s": obj.grade_s,
+            "sh": obj.grade_sh,
+            "a": obj.grade_a,
+        }
+        s.level = {
+            "current": obj.level_current,
+            "progress": obj.level_progress,
+        }
+        return s
diff --git a/app/database/user_account_history.py b/app/database/user_account_history.py
new file mode 100644
index 0000000..217c8eb
--- /dev/null
+++ b/app/database/user_account_history.py
@@ -0,0 +1,45 @@
+from datetime import UTC, datetime
+from enum import Enum
+
+from app.models.model import UTCBaseModel
+
+from sqlmodel import BigInteger, Column, Field, ForeignKey, Integer, SQLModel
+
+
+class UserAccountHistoryType(str, Enum):
+    NOTE = "note"
+    RESTRICTION = "restriction"
+    SLIENCE = "silence"
+    TOURNAMENT_BAN = "tournament_ban"
+
+
+class UserAccountHistoryBase(SQLModel, UTCBaseModel):
+    description: str | None = None
+    length: int
+    permanent: bool = False
+    timestamp: datetime = Field(default=datetime.now(UTC))
+    type: UserAccountHistoryType
+
+
+class UserAccountHistory(UserAccountHistoryBase, table=True):
+    __tablename__ = "user_account_history"  # pyright: ignore[reportAssignmentType]
+
+    id: int | None = Field(
+        sa_column=Column(
+            Integer,
+            autoincrement=True,
+            index=True,
+            primary_key=True,
+        )
+    )
+    user_id: int = Field(
+        sa_column=Column(BigInteger, ForeignKey("lazer_users.id"), index=True)
+    )
+
+
+class UserAccountHistoryResp(UserAccountHistoryBase):
+    id: int | None = None
+
+    @classmethod
+    def from_db(cls, db_model: UserAccountHistory) -> "UserAccountHistoryResp":
+        return cls.model_validate(db_model)
diff --git a/app/models/model.py b/app/models/model.py
new file mode 100644
index 0000000..bc00585
--- /dev/null
+++ b/app/models/model.py
@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+from datetime import UTC, datetime
+
+from pydantic import BaseModel, field_serializer
+
+
+class UTCBaseModel(BaseModel):
+    @field_serializer("*", when_used="json")
+    def serialize_datetime(self, v, _info):
+        if isinstance(v, datetime):
+            if v.tzinfo is None:
+                v = v.replace(tzinfo=UTC)
+            return v.astimezone(UTC).isoformat()
+        return v