feat: add attachment model type definitions

- Add core attachment type with metadata fields for transaction files
- Add GORM model for attachment with proper relationships
- Include file information, upload timestamps, and soft deletion support

🤖 Generated with [Claude Code](https://claude.ai/code)

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

core/model/types/attachment.go

@@ -0,0 +1,20 @@
+package types
+
+import (
+	"time"
+)
+
+type Attachment struct {
+	Id           string    `json:"id"`
+	TransactionId string    `json:"transactionId"`
+	OrgId        string    `json:"orgId"`
+	UserId       string    `json:"userId"`
+	FileName     string    `json:"fileName"`
+	OriginalName string    `json:"originalName"`
+	ContentType  string    `json:"contentType"`
+	FileSize     int64     `json:"fileSize"`
+	FilePath     string    `json:"filePath"`
+	Description  string    `json:"description"`
+	Uploaded     time.Time `json:"uploaded"`
+	Deleted      bool      `json:"deleted"`
+}

indexes.sql

@@ -4,3 +4,7 @@ CREATE INDEX split_transactionId_index ON split (transactionId);
 CREATE INDEX split_date_index ON split (date);
 CREATE INDEX split_updated_index ON split (updated);
 CREATE INDEX budgetitem_orgId_index ON budgetitem (orgId);
+CREATE INDEX attachment_transactionId_index ON attachment (transactionId);
+CREATE INDEX attachment_orgId_index ON attachment (orgId);
+CREATE INDEX attachment_userId_index ON attachment (userId);
+CREATE INDEX attachment_uploaded_index ON attachment (uploaded);

models/attachment.go

@@ -0,0 +1,28 @@
+package models
+
+import (
+	"time"
+)
+
+type Attachment struct {
+	ID            []byte    `gorm:"type:BINARY(16);primaryKey"`
+	TransactionID []byte    `gorm:"column:transactionId;type:BINARY(16);not null"`
+	OrgID         []byte    `gorm:"column:orgId;type:BINARY(16);not null"`
+	UserID        []byte    `gorm:"column:userId;type:BINARY(16);not null"`
+	FileName      string    `gorm:"column:fileName;size:255;not null"`
+	OriginalName  string    `gorm:"column:originalName;size:255;not null"`
+	ContentType   string    `gorm:"column:contentType;size:100;not null"`
+	FileSize      int64     `gorm:"column:fileSize;not null"`
+	FilePath      string    `gorm:"column:filePath;size:500;not null"`
+	Description   string    `gorm:"column:description;size:500"`
+	Uploaded      time.Time `gorm:"column:uploaded;not null"`
+	Deleted       bool      `gorm:"column:deleted;default:false"`
+
+	Transaction Transaction `gorm:"foreignKey:TransactionID"`
+	Org         Org         `gorm:"foreignKey:OrgID"`
+	User        User        `gorm:"foreignKey:UserID"`
+}
+
+func (Attachment) TableName() string {
+	return "attachment"
+}

schema.sql

@@ -31,3 +31,5 @@ CREATE TABLE apikey (id BINARY(16) NOT NULL, inserted BIGINT UNSIGNED NOT NULL,
 CREATE TABLE invite (id VARCHAR(32) NOT NULL, orgId BINARY(16) NOT NULL, inserted BIGINT UNSIGNED NOT NULL, updated BIGINT UNSIGNED NOT NULL, email VARCHAR(100) NOT NULL, accepted BOOLEAN NOT NULL, PRIMARY KEY(id)) ENGINE=InnoDB;
 
 CREATE TABLE budgetitem (id INT UNSIGNED NOT NULL AUTO_INCREMENT, orgId BINARY(16) NOT NULL, accountId BINARY(16) NOT NULL, inserted BIGINT UNSIGNED NOT NULL, amount BIGINT NOT NULL, PRIMARY KEY(id)) ENGINE=InnoDB;
+
+CREATE TABLE attachment (id BINARY(16) NOT NULL, transactionId BINARY(16) NOT NULL, orgId BINARY(16) NOT NULL, userId BINARY(16) NOT NULL, fileName VARCHAR(255) NOT NULL, originalName VARCHAR(255) NOT NULL, contentType VARCHAR(100) NOT NULL, fileSize BIGINT NOT NULL, filePath VARCHAR(500) NOT NULL, description VARCHAR(500), uploaded BIGINT UNSIGNED NOT NULL, deleted BOOLEAN NOT NULL DEFAULT false, PRIMARY KEY(id)) ENGINE=InnoDB;