backend barebone done, big chunk of work done

server/internal/store/store.go

@@ -0,0 +1,71 @@
+package store
+
+import (
+	"time"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+// Store provides database access via a connection pool.
+type Store struct {
+	pool *pgxpool.Pool
+}
+
+// New creates a new Store with the given pgx pool.
+func New(pool *pgxpool.Pool) *Store {
+	return &Store{pool: pool}
+}
+
+// User represents a user account.
+type User struct {
+	ID           int64
+	Username     string
+	DisplayName  string
+	PasswordHash string
+	Avatar       string
+	CreatedAt    time.Time
+}
+
+// Session represents a user session for refresh tokens.
+type Session struct {
+	ID          int64
+	UserID      int64
+	RefreshHash string
+	ExpiresAt   time.Time
+	CreatedAt   time.Time
+	RevokedAt   *time.Time
+	UserAgent   string
+	IP          string
+}
+
+// Conversation represents a chat conversation.
+type Conversation struct {
+	ID        int64
+	Type      string
+	CreatedAt time.Time
+}
+
+// ConversationSummary provides a conversation with its last message and unread count.
+type ConversationSummary struct {
+	Conversation
+	LastMessage *Message
+	UnreadCount int64
+}
+
+// Message represents a message sent within a conversation.
+type Message struct {
+	ID             int64
+	ConversationID int64
+	SenderID       int64
+	Body           string
+	CreatedAt      time.Time
+	EditedAt       *time.Time
+	DeletedAt      *time.Time
+}
+
+// Contact represents a contact relationship between users.
+type Contact struct {
+	OwnerID   int64
+	ContactID int64
+	CreatedAt time.Time
+}