diff --git a/docs/project-memory/plans/【实施计划】陶泥儿导出文件草稿化与发布媒体直传-2026-10-06.md b/docs/project-memory/plans/【实施计划】陶泥儿导出文件草稿化与发布媒体直传-2026-10-06.md
index aeb679c08..8fb6a0a7b 100644
--- a/docs/project-memory/plans/【实施计划】陶泥儿导出文件草稿化与发布媒体直传-2026-10-06.md
+++ b/docs/project-memory/plans/【实施计划】陶泥儿导出文件草稿化与发布媒体直传-2026-10-06.md
@@ -138,7 +138,7 @@
 - `packages/shared/src/contracts/gameDistribution.ts`：镜像同步；`GameDistributionGameSummary.coverObjectKey` / `screenshots` 维持 objectKey。
 
 **Step 2 spacetime-module**
-- `GameDistributionGame`：删 `cover_asset_id`；`cover_object_key` 保留；`screenshots_json` 改为 objectKey 数组。
+- `GameDistributionGame`：**保留 `cover_asset_id` 并标记退役**（保持在原字段位置、宿主不再写入，仅占位，读逻辑不得依赖），避免 SpacetimeDB 破坏性 schema 变更；`cover_object_key` 保留；`screenshots_json` 改为 objectKey 数组。
 - `GameDistributionFrozenMetadata`：删 `cover_asset_id`；`screenshots: Vec<String>`（objectKey）；删 `GameDistributionFrozenScreenshot.asset_id`。
 - `apply_game_distribution_frozen_metadata`、`GameDistributionCreateGameInput` / `GameDistributionUpdateMetadataInput` / `GameDistributionGameSnapshot` 同步。
 - 公开读授权：删除 `game_distribution_asset_has_public_read_grant(ctx, asset_object_id)` 及其在 `editor_project_storage::asset_location_has_public_showcase_read_grant` 的调用（发布图不再经素材库读）；公开判定迁到新路由的域内判定（已发布且 active + objectKey 命中）。
diff --git a/server-rs/crates/spacetime-client/src/module_bindings/game_distribution_game_type.rs b/server-rs/crates/spacetime-client/src/module_bindings/game_distribution_game_type.rs
index 495167a9a..02da2a911 100644
--- a/server-rs/crates/spacetime-client/src/module_bindings/game_distribution_game_type.rs
+++ b/server-rs/crates/spacetime-client/src/module_bindings/game_distribution_game_type.rs
@@ -14,6 +14,7 @@ pub struct GameDistributionGame {
     pub description: String,
     pub category: String,
     pub tags_json: String,
+    pub cover_asset_id: Option<String>,
     pub author_name: Option<String>,
     pub author_avatar_url: Option<String>,
     pub device_support_desktop: bool,
@@ -49,6 +50,7 @@ pub struct GameDistributionGameCols {
     pub description: __sdk::__query_builder::Col<GameDistributionGame, String>,
     pub category: __sdk::__query_builder::Col<GameDistributionGame, String>,
     pub tags_json: __sdk::__query_builder::Col<GameDistributionGame, String>,
+    pub cover_asset_id: __sdk::__query_builder::Col<GameDistributionGame, Option<String>>,
     pub author_name: __sdk::__query_builder::Col<GameDistributionGame, Option<String>>,
     pub author_avatar_url: __sdk::__query_builder::Col<GameDistributionGame, Option<String>>,
     pub device_support_desktop: __sdk::__query_builder::Col<GameDistributionGame, bool>,
@@ -80,6 +82,7 @@ impl __sdk::__query_builder::HasCols for GameDistributionGame {
             description: __sdk::__query_builder::Col::new(table_name, "description"),
             category: __sdk::__query_builder::Col::new(table_name, "category"),
             tags_json: __sdk::__query_builder::Col::new(table_name, "tags_json"),
+            cover_asset_id: __sdk::__query_builder::Col::new(table_name, "cover_asset_id"),
             author_name: __sdk::__query_builder::Col::new(table_name, "author_name"),
             author_avatar_url: __sdk::__query_builder::Col::new(table_name, "author_avatar_url"),
             device_support_desktop: __sdk::__query_builder::Col::new(
diff --git a/server-rs/crates/spacetime-module/src/game_distribution.rs b/server-rs/crates/spacetime-module/src/game_distribution.rs
index c86356477..e4aebb90b 100644
--- a/server-rs/crates/spacetime-module/src/game_distribution.rs
+++ b/server-rs/crates/spacetime-module/src/game_distribution.rs
@@ -738,6 +738,9 @@ pub struct GameDistributionGame {
     pub(crate) description: String,
     pub(crate) category: String,
     pub(crate) tags_json: String,
+    /// 已退役：封面改用 `cover_object_key`（OSS objectKey）。字段保留且保持在原位，避免
+    /// SpacetimeDB 破坏性 schema 变更；宿主不再写入，只占位，读逻辑不得依赖它。
+    pub(crate) cover_asset_id: Option<String>,
     pub(crate) author_name: Option<String>,
     pub(crate) author_avatar_url: Option<String>,
     pub(crate) device_support_desktop: bool,
@@ -2078,6 +2081,7 @@ fn create_game_distribution_game_tx(
             description: input.description.unwrap_or_default(),
             category,
             tags_json: input.tags_json,
+            cover_asset_id: None,
             author_name: input.author_name,
             author_avatar_url: input.author_avatar_url,
             device_support_desktop: input.device_support_desktop,
@@ -4398,6 +4402,7 @@ mod tests {
             description: String::new(),
             category: "其他".to_string(),
             tags_json: "[]".to_string(),
+            cover_asset_id: None,
             author_name: None,
             author_avatar_url: None,
             device_support_desktop: true,
diff --git a/server-rs/crates/spacetime-module/src/migration.rs b/server-rs/crates/spacetime-module/src/migration.rs
index af2f3f0cc..704461678 100644
--- a/server-rs/crates/spacetime-module/src/migration.rs
+++ b/server-rs/crates/spacetime-module/src/migration.rs
@@ -215,8 +215,8 @@ macro_rules! migration_tables {
             // 定价：游戏表末尾追加 price_mud_points（默认 0），购买记录含成交价快照与钱包流水 ID。
             // 资料随版本冻结：版本表末尾追加 metadata_json，游戏表末尾追加
             // cover_object_key / screenshots_json，均为可空列，旧行按“未冻结资料”处理。
-            // 媒体去 assetId 化：游戏表删除 cover_asset_id，封面/截图只保留 OSS objectKey
-            // （封面 cover_object_key、截图 screenshots_json 为 objectKey 字符串数组）。
+            // 媒体去 assetId 化：游戏表保留 cover_asset_id 但标记退役（不再写入、仅占位），
+            // 封面/截图改用 OSS objectKey（封面 cover_object_key、截图 screenshots_json 为 objectKey 字符串数组）。
             // 软删除：游戏表末尾追加可空 deleted_at；非空表示作者已删除该作品，
             // 行本身仍随迁移导出，版本行与冻结资料保持不可变。
             game_distribution_game,