diff --git a/go.mod b/go.mod
index 0a47dd9..5d33b41 100644
--- a/go.mod
+++ b/go.mod
@@ -7,4 +7,11 @@ toolchain go1.23.10
 require (
 	github.com/golang-jwt/jwt/v5 v5.2.2
 	github.com/joho/godotenv v1.5.1
+	github.com/tursodatabase/libsql-client-go v0.0.0-20240902231107-85af5b9d094d
+)
+
+require (
+	github.com/antlr4-go/antlr/v4 v4.13.0 // indirect
+	github.com/coder/websocket v1.8.12 // indirect
+	golang.org/x/exp v0.0.0-20240325151524-a685a6edb6d8 // indirect
 )
diff --git a/go.sum b/go.sum
index a5e4eeb..d5a5504 100644
--- a/go.sum
+++ b/go.sum
@@ -1,4 +1,12 @@
+github.com/antlr4-go/antlr/v4 v4.13.0 h1:lxCg3LAv+EUK6t1i0y1V6/SLeUi0eKEKdhQAlS8TVTI=
+github.com/antlr4-go/antlr/v4 v4.13.0/go.mod h1:pfChB/xh/Unjila75QW7+VU4TSnWnnk9UTnmpPaOR2g=
+github.com/coder/websocket v1.8.12 h1:5bUXkEPPIbewrnkU8LTCLVaxi4N4J8ahufH2vlo4NAo=
+github.com/coder/websocket v1.8.12/go.mod h1:LNVeNrXQZfe5qhS9ALED3uA+l5pPqvwXg3CKoDBB2gs=
 github.com/golang-jwt/jwt/v5 v5.2.2 h1:Rl4B7itRWVtYIHFrSNd7vhTiz9UpLdi6gZhZ3wEeDy8=
 github.com/golang-jwt/jwt/v5 v5.2.2/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
 github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
 github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
+github.com/tursodatabase/libsql-client-go v0.0.0-20240902231107-85af5b9d094d h1:dOMI4+zEbDI37KGb0TI44GUAwxHF9cMsIoDTJ7UmgfU=
+github.com/tursodatabase/libsql-client-go v0.0.0-20240902231107-85af5b9d094d/go.mod h1:l8xTsYB90uaVdMHXMCxKKLSgw5wLYBwBKKefNIUnm9s=
+golang.org/x/exp v0.0.0-20240325151524-a685a6edb6d8 h1:aAcj0Da7eBAtrTp03QXWvm88pSyOt+UgdZw2BFZ+lEw=
+golang.org/x/exp v0.0.0-20240325151524-a685a6edb6d8/go.mod h1:CQ1k9gNrJ50XIzaKCRR2hssIjF07kZFEiieALBM/ARQ=
diff --git a/internals/db/progress.go b/internals/db/progress.go
new file mode 100644
index 0000000..1db59c2
--- /dev/null
+++ b/internals/db/progress.go
@@ -0,0 +1,94 @@
+package db
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"time"
+
+	_ "github.com/tursodatabase/libsql-client-go/libsql"
+)
+
+type Progress struct {
+	ID          string
+	UserID      string
+	LevelID     string
+	Status      string
+	CompletedAt sql.NullTime
+	AttemptData sql.NullString
+	Stars       sql.NullInt64
+	CreatedAt   time.Time
+	UpdatedAt   time.Time
+}
+
+type ProgressClient struct {
+	db *sql.DB
+}
+
+func NewProgressClient(db *sql.DB) *ProgressClient {
+	return &ProgressClient{db: db}
+}
+
+func (c *ProgressClient) UpsertProgress(ctx context.Context, p *Progress) error {
+	_, err := c.db.ExecContext(ctx, `
+		INSERT INTO progress (id, user_id, level_id, status, completed_at, attempt_data, stars)
+		VALUES (?, ?, ?, ?, ?, ?, ?)
+		ON CONFLICT(user_id, level_id) DO UPDATE SET
+		  status = excluded.status,
+		  completed_at = excluded.completed_at,
+		  attempt_data = excluded.attempt_data,
+		  stars = excluded.stars,
+		  updated_at = CURRENT_TIMESTAMP
+	`, p.ID, p.UserID, p.LevelID, p.Status, p.CompletedAt, p.AttemptData, p.Stars)
+	return err
+}
+
+func (c *ProgressClient) GetProgressByUser(ctx context.Context, userID string) ([]*Progress, error) {
+	rows, err := c.db.QueryContext(ctx, `
+		SELECT id, user_id, level_id, status, completed_at, attempt_data, stars, created_at, updated_at
+		FROM progress
+		WHERE user_id = ?
+	`, userID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var progressList []*Progress
+	for rows.Next() {
+		var p Progress
+		err := rows.Scan(&p.ID, &p.UserID, &p.LevelID, &p.Status, &p.CompletedAt, &p.AttemptData, &p.Stars, &p.CreatedAt, &p.UpdatedAt)
+		if err != nil {
+			return nil, err
+		}
+		progressList = append(progressList, &p)
+	}
+
+	return progressList, nil
+}
+
+func (c *ProgressClient) GetProgress(ctx context.Context, userID, levelID string) (*Progress, error) {
+	row := c.db.QueryRowContext(ctx, `
+		SELECT id, user_id, level_id, status, completed_at, attempt_data, stars, created_at, updated_at
+		FROM progress
+		WHERE user_id = ? AND level_id = ?
+	`, userID, levelID)
+
+	var p Progress
+	err := row.Scan(&p.ID, &p.UserID, &p.LevelID, &p.Status, &p.CompletedAt, &p.AttemptData, &p.Stars, &p.CreatedAt, &p.UpdatedAt)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, nil
+		}
+		return nil, err
+	}
+	return &p, nil
+}
+
+func (c *ProgressClient) DeleteProgress(ctx context.Context, userID, levelID string) error {
+	_, err := c.db.ExecContext(ctx, `
+		DELETE FROM progress
+		WHERE user_id = ? AND level_id = ?
+	`, userID, levelID)
+	return err
+}
diff --git a/internals/db/subscriptions.go b/internals/db/subscriptions.go
new file mode 100644
index 0000000..65ce182
--- /dev/null
+++ b/internals/db/subscriptions.go
@@ -0,0 +1,64 @@
+package db
+
+import (
+	"context"
+	"database/sql"
+	"time"
+
+	_ "github.com/tursodatabase/libsql-client-go/libsql"
+)
+
+type Subscription struct {
+	ID        string
+	UserID    string
+	StripeID  string
+	Status    string
+	StartedAt time.Time
+	EndsAt    sql.NullTime
+}
+
+type SubscriptionClient struct {
+	db *sql.DB
+}
+
+func NewSubscriptionClient(db *sql.DB) *SubscriptionClient {
+	return &SubscriptionClient{db: db}
+}
+
+// Insert or update subscription
+func (c *SubscriptionClient) Upsert(ctx context.Context, s *Subscription) error {
+	_, err := c.db.ExecContext(ctx, `
+		INSERT INTO subscriptions (id, user_id, stripe_id, status, started_at, ends_at)
+		VALUES (?, ?, ?, ?, ?, ?)
+		ON CONFLICT(id) DO UPDATE SET
+			status = excluded.status,
+			started_at = excluded.started_at,
+			ends_at = excluded.ends_at
+	`, s.ID, s.UserID, s.StripeID, s.Status, s.StartedAt, s.EndsAt)
+	return err
+}
+
+// Get by user ID
+func (c *SubscriptionClient) GetByUserID(ctx context.Context, userID string) (*Subscription, error) {
+	row := c.db.QueryRowContext(ctx, `
+		SELECT id, user_id, stripe_id, status, started_at, ends_at
+		FROM subscriptions
+		WHERE user_id = ?
+	`, userID)
+
+	var s Subscription
+	err := row.Scan(&s.ID, &s.UserID, &s.StripeID, &s.Status, &s.StartedAt, &s.EndsAt)
+	if err != nil {
+		return nil, err
+	}
+	return &s, nil
+}
+
+// Delete by user ID
+func (c *SubscriptionClient) DeleteByUserID(ctx context.Context, userID string) error {
+	_, err := c.db.ExecContext(ctx, `
+		DELETE FROM subscriptions
+		WHERE user_id = ?
+	`, userID)
+	return err
+}
diff --git a/internals/db/users.go b/internals/db/users.go
new file mode 100644
index 0000000..f68de77
--- /dev/null
+++ b/internals/db/users.go
@@ -0,0 +1,57 @@
+package db
+
+import (
+	"context"
+	"database/sql"
+	"time"
+
+	_ "github.com/tursodatabase/libsql-client-go/libsql"
+)
+
+type User struct {
+	ID          string
+	GitHubID    int64
+	GitHubLogin string
+	AvatarURL   string
+	Email       string
+	CreatedAt   time.Time
+	UpdatedAt   time.Time
+}
+
+type UserClient struct {
+	db *sql.DB
+}
+
+func NewUserClient(db *sql.DB) *UserClient {
+	return &UserClient{db: db}
+}
+
+func (uc *UserClient) UpsertUser(ctx context.Context, user User) error {
+	_, err := uc.db.ExecContext(ctx, `
+		INSERT INTO users (id, github_id, github_login, avatar_url, email)
+		VALUES (?, ?, ?, ?, ?)
+		ON CONFLICT(github_id) DO UPDATE SET
+			github_login = excluded.github_login,
+			avatar_url = excluded.avatar_url,
+			email = excluded.email,
+			updated_at = CURRENT_TIMESTAMP
+	`, user.ID, user.GitHubID, user.GitHubLogin, user.AvatarURL, user.Email)
+	return err
+}
+
+func (uc *UserClient) GetUserByGitHubID(ctx context.Context, githubID int64) (*User, error) {
+	row := uc.db.QueryRowContext(ctx, `
+		SELECT id, github_id, github_login, avatar_url, email, created_at, updated_at
+		FROM users WHERE github_id = ?
+	`, githubID)
+
+	var user User
+	err := row.Scan(
+		&user.ID, &user.GitHubID, &user.GitHubLogin,
+		&user.AvatarURL, &user.Email, &user.CreatedAt, &user.UpdatedAt,
+	)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	return &user, err
+}