feat: add core data model

backend/internal/db/db.go

@@ -0,0 +1,10 @@
+package db
+
+import (
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+)
+
+func Open(databaseURL string) (*gorm.DB, error) {
+	return gorm.Open(postgres.Open(databaseURL), &gorm.Config{})
+}

backend/internal/domain/models.go

@@ -0,0 +1,138 @@
+package domain
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+type User struct {
+	ID           uint   `gorm:"primaryKey"`
+	Email        string `gorm:"uniqueIndex;not null"`
+	DisplayName  string `gorm:"not null"`
+	PasswordHash string `gorm:"not null"`
+	Role         string `gorm:"not null;default:user"`
+	CreatedAt    time.Time
+	UpdatedAt    time.Time
+}
+
+type Project struct {
+	ID          uint   `gorm:"primaryKey"`
+	OwnerID     uint   `gorm:"index;not null"`
+	Name        string `gorm:"not null"`
+	Description string
+	CreatedAt   time.Time
+	UpdatedAt   time.Time
+}
+
+type InboxItem struct {
+	ID         uint   `gorm:"primaryKey"`
+	ProjectID  uint   `gorm:"index;not null"`
+	CreatedBy  uint   `gorm:"index;not null"`
+	SourceType string `gorm:"not null"`
+	Title      string
+	Body       string
+	Status     string `gorm:"not null;default:open"`
+	CreatedAt  time.Time
+	UpdatedAt  time.Time
+}
+
+type Task struct {
+	ID          uint   `gorm:"primaryKey"`
+	ProjectID   uint   `gorm:"index;not null"`
+	CreatedBy   uint   `gorm:"index;not null"`
+	AssigneeID  *uint  `gorm:"index"`
+	Title       string `gorm:"not null"`
+	Description string
+	Status      string `gorm:"not null;default:open"`
+	SortOrder   int    `gorm:"not null;default:0"`
+	DueAt       *time.Time
+	CreatedAt   time.Time
+	UpdatedAt   time.Time
+}
+
+type Note struct {
+	ID        uint   `gorm:"primaryKey"`
+	ProjectID uint   `gorm:"index;not null"`
+	CreatedBy uint   `gorm:"index;not null"`
+	Title     string `gorm:"not null"`
+	Markdown  string `gorm:"type:text"`
+	CreatedAt time.Time
+	UpdatedAt time.Time
+}
+
+type Source struct {
+	ID          uint   `gorm:"primaryKey"`
+	ProjectID   uint   `gorm:"index;not null"`
+	CreatedBy   uint   `gorm:"index;not null"`
+	Kind        string `gorm:"not null"`
+	Title       string `gorm:"not null"`
+	URL         string
+	FilePath    string
+	ContentText string `gorm:"type:text"`
+	CreatedAt   time.Time
+	UpdatedAt   time.Time
+}
+
+type AISession struct {
+	ID        uint   `gorm:"primaryKey"`
+	ProjectID uint   `gorm:"index;not null"`
+	CreatedBy uint   `gorm:"index;not null"`
+	Title     string `gorm:"not null"`
+	Context   string `gorm:"type:text"`
+	CreatedAt time.Time
+	UpdatedAt time.Time
+}
+
+type Tag struct {
+	ID        uint   `gorm:"primaryKey"`
+	ProjectID uint   `gorm:"index;not null"`
+	Name      string `gorm:"not null"`
+	CreatedAt time.Time
+}
+
+type ProjectEvent struct {
+	ID         uint   `gorm:"primaryKey"`
+	ProjectID  uint   `gorm:"index;not null"`
+	ActorID    uint   `gorm:"index;not null"`
+	EventType  string `gorm:"not null"`
+	EntityType string `gorm:"not null"`
+	EntityID   uint   `gorm:"not null"`
+	Summary    string `gorm:"not null"`
+	CreatedAt  time.Time
+}
+
+type AIKey struct {
+	ID              uint   `gorm:"primaryKey"`
+	UserID          uint   `gorm:"uniqueIndex;not null"`
+	Provider        string `gorm:"not null"`
+	EncryptedAPIKey string `gorm:"not null"`
+	CreatedAt       time.Time
+	UpdatedAt       time.Time
+}
+
+type AICallLog struct {
+	ID          uint   `gorm:"primaryKey"`
+	UserID      uint   `gorm:"index;not null"`
+	Provider    string `gorm:"not null"`
+	UsedKeyType string `gorm:"not null"`
+	Action      string `gorm:"not null"`
+	Status      string `gorm:"not null"`
+	Error       string
+	CreatedAt   time.Time
+}
+
+type TaskShare struct {
+	ID         uint   `gorm:"primaryKey"`
+	TaskID     uint   `gorm:"index;not null"`
+	ObjectType string `gorm:"not null"`
+	ObjectID   uint   `gorm:"not null"`
+	CreatedAt  time.Time
+}
+
+func AutoMigrate(database *gorm.DB) error {
+	return database.AutoMigrate(
+		&User{}, &Project{}, &InboxItem{}, &Task{}, &Note{}, &Source{},
+		&AISession{}, &Tag{}, &ProjectEvent{}, &AIKey{}, &AICallLog{}, &TaskShare{},
+	)
+}

backend/internal/domain/models_test.go

@@ -0,0 +1,23 @@
+package domain
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"github.com/glebarez/sqlite"
+	"gorm.io/gorm"
+)
+
+func TestAutoMigrateCreatesCoreTables(t *testing.T) {
+	database, err := gorm.Open(sqlite.Open("file::memory:?cache=shared"), &gorm.Config{})
+	require.NoError(t, err)
+
+	require.NoError(t, AutoMigrate(database))
+
+	for _, table := range []string{
+		"users", "projects", "inbox_items", "tasks", "notes", "sources",
+		"ai_sessions", "tags", "project_events", "ai_keys", "ai_call_logs", "task_shares",
+	} {
+		require.True(t, database.Migrator().HasTable(table), "missing table %s", table)
+	}
+}