Initial commit: email-openclaw bridge v1

Full pipeline: IMAP ingress -> OpenClaw dispatch -> callback -> SMTP reply.
SQLite stateful storage with idempotency, threading, and retry logic.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

internal/database/repository.go

@@ -0,0 +1,65 @@
+package database
+
+import (
+	"errors"
+
+	"gorm.io/gorm"
+)
+
+// FindByMessageID returns the task with the given message_id, or nil if not found.
+func FindByMessageID(db *gorm.DB, messageID string) (*Task, error) {
+	var task Task
+	err := db.Where("message_id = ?", messageID).First(&task).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &task, nil
+}
+
+// FindLatestByThreadID returns the most recent COMPLETED task in the thread.
+func FindLatestByThreadID(db *gorm.DB, threadID string) (*Task, error) {
+	var task Task
+	err := db.Where("thread_id = ? AND status = ?", threadID, StatusCompleted).
+		Order("created_at DESC").First(&task).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &task, nil
+}
+
+// FindByTaskUUID returns the task with the given task_uuid.
+func FindByTaskUUID(db *gorm.DB, taskUUID string) (*Task, error) {
+	var task Task
+	err := db.Where("task_uuid = ?", taskUUID).First(&task).Error
+	if errors.Is(err, gorm.ErrRecordNotFound) {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &task, nil
+}
+
+// ThreadHistory returns all COMPLETED tasks for a thread, ordered chronologically.
+func ThreadHistory(db *gorm.DB, threadID string) ([]Task, error) {
+	var tasks []Task
+	err := db.Where("thread_id = ? AND status = ?", threadID, StatusCompleted).
+		Order("created_at ASC").Find(&tasks).Error
+	return tasks, err
+}
+
+// CreateTask inserts a new task record.
+func CreateTask(db *gorm.DB, task *Task) error {
+	return db.Create(task).Error
+}
+
+// UpdateTask saves changes to an existing task record.
+func UpdateTask(db *gorm.DB, task *Task) error {
+	return db.Save(task).Error
+}