disable TypeORM query cache by default

.config/ci.yml

@@ -115,8 +115,10 @@ db:
   user: postgres
   pass: ci
 
-  # Whether disable Caching queries
+  # If false, then query results will be cached in redis.
-  #disableCache: true
+  # If true (default), then queries will not be cached.
+  # This will reduce database load at the cost of increased Redis traffic and risk of bugs and unpredictable behavior.
+  #disableCache: false
 
   # Extra Connection options
   #extra:

.config/cypress-devcontainer.yml

@@ -57,8 +57,10 @@ db:
   user: postgres
   pass: postgres
 
-  # Whether disable Caching queries
+  # If false, then query results will be cached in redis.
-  #disableCache: true
+  # If true (default), then queries will not be cached.
+  # This will reduce database load at the cost of increased Redis traffic and risk of bugs and unpredictable behavior.
+  #disableCache: false
 
   # Extra Connection options
   #extra:

.config/docker_example.yml

@@ -118,8 +118,10 @@ db:
   user: example-misskey-user
   pass: example-misskey-pass
 
-  # Whether disable Caching queries
+  # If false, then query results will be cached in redis.
-  #disableCache: true
+  # If true (default), then queries will not be cached.
+  # This will reduce database load at the cost of increased Redis traffic and risk of bugs and unpredictable behavior.
+  #disableCache: false
 
   # Extra Connection options
   #extra:

.config/example.yml

@@ -121,8 +121,12 @@ db:
   user: sharkey
   pass: example-misskey-pass
 
-  # Whether disable Caching queries
+  # If false, then query results will be cached in redis.
-  #disableCache: true
+  # If true (default), then queries will not be cached.
+  # This will reduce database load at the cost of increased Redis traffic and risk of bugs and unpredictable behavior.
+  #disableCache: false
+
+  #
 
   # Extra Connection options
   #extra:

packages/backend/src/postgres.ts

@@ -306,7 +306,7 @@ export function createPostgresDataSource(config: Config) {
 		} : {}),
 		synchronize: process.env.NODE_ENV === 'test',
 		dropSchema: process.env.NODE_ENV === 'test',
-		cache: !config.db.disableCache && process.env.NODE_ENV !== 'test' ? { // dbをcloseしても何故かredisのコネクションが内部的に残り続けるようで、テストの際に支障が出るため無効にする(キャッシュも含めてテストしたいため本当は有効にしたいが...)
+		cache: config.db.disableCache === false && process.env.NODE_ENV !== 'test' ? { // dbをcloseしても何故かredisのコネクションが内部的に残り続けるようで、テストの際に支障が出るため無効にする(キャッシュも含めてテストしたいため本当は有効にしたいが...)
 			type: 'ioredis',
 			options: {
 				...config.redis,