Rework backing storage system

Step one: Copy the struct definitions over into a new, dedicated
submodule
Step two: Make a generator script
Step three: Define helper functions for various queries

storage-new/models/MediaMetadata.go

@@ -0,0 +1,29 @@
+package models
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+)
+
+type MediaMetadata struct {
+	ID        string    `gorm:"primarykey"` // The unique ID of this media file
+	CreatedAt time.Time // When this entry was created
+	UpdatedAt time.Time // When this entry was last updated
+	// When this entry was deleted (for soft deletions)
+	// Soft delete means that this entry still exists in the db, but gorm won't include it anymore unless specifically told to
+	// If not null, this entry is marked as deleted
+	DeletedAt gorm.DeletedAt `gorm:"index"`
+	OwnedBy   string         // Account id this media belongs to
+	Remote    bool           // whether the attachment is a remote one
+	// Where the media is stored. Url
+	Location string
+	Type     string // What media type this is following mime types, eg image/png
+	// Name of the file
+	// Could be <emote-name>.png, <server-name>.webp for example. Or the name the file was uploaded with
+	Name string
+	// Alternative description of the media file's content
+	AltText string
+	// Whether the media is to be blurred by default
+	Blurred bool
+}