diff --git a/README.md b/README.md
index edf9abf..5d4358c 100755
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ pnpm i
 pnpm run build
 
 # データベースのマイグレーション
-pnpm -F backend mikro migration:up
+pnpm -F backend migrator up
 
 # 起動
 pnpm -F backend start
diff --git a/packages/backend/src/migrations/.snapshot-chat.json b/packages/backend/src/migrations/.snapshot-chat.json
index f946015..dc68dbc 100644
--- a/packages/backend/src/migrations/.snapshot-chat.json
+++ b/packages/backend/src/migrations/.snapshot-chat.json
@@ -24,19 +24,19 @@
         },
         "value": {
           "name": "value",
-          "type": "text",
+          "type": "varchar(4096)",
           "unsigned": false,
           "autoincrement": false,
           "primary": false,
           "nullable": false,
           "unique": false,
-          "length": null,
+          "length": 4096,
           "precision": null,
           "scale": null,
           "default": null,
           "comment": null,
           "enumItems": [],
-          "mappedType": "text"
+          "mappedType": "string"
         }
       },
       "name": "config",
@@ -107,6 +107,22 @@
           "enumItems": [],
           "mappedType": "string"
         },
+        "icon": {
+          "name": "icon",
+          "type": "varchar(255)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": true,
+          "unique": false,
+          "length": 255,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
         "profile": {
           "name": "profile",
           "type": "varchar(4096)",
@@ -155,8 +171,8 @@
           "enumItems": [],
           "mappedType": "text"
         },
-        "is_owner": {
-          "name": "is_owner",
+        "is_admin": {
+          "name": "is_admin",
           "type": "boolean",
           "unsigned": false,
           "autoincrement": false,
@@ -397,6 +413,543 @@
         }
       },
       "nativeEnums": {}
+    },
+    {
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "varchar(10)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": true,
+          "nullable": false,
+          "unique": false,
+          "length": 10,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "text": {
+          "name": "text",
+          "type": "varchar(4096)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "unique": false,
+          "length": 4096,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "created_by_id": {
+          "name": "created_by_id",
+          "type": "varchar(10)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": true,
+          "unique": false,
+          "length": 10,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamptz",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "unique": false,
+          "length": 6,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "datetime"
+        }
+      },
+      "name": "log",
+      "schema": "public",
+      "indexes": [
+        {
+          "keyName": "log_pkey",
+          "columnNames": [
+            "id"
+          ],
+          "composite": false,
+          "constraint": true,
+          "primary": true,
+          "unique": true
+        }
+      ],
+      "checks": [],
+      "foreignKeys": {
+        "log_created_by_id_foreign": {
+          "constraintName": "log_created_by_id_foreign",
+          "columnNames": [
+            "created_by_id"
+          ],
+          "localTableName": "public.log",
+          "referencedColumnNames": [
+            "id"
+          ],
+          "referencedTableName": "public.user",
+          "deleteRule": "set null",
+          "updateRule": "cascade"
+        }
+      },
+      "nativeEnums": {}
+    },
+    {
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "varchar(10)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": true,
+          "nullable": false,
+          "unique": false,
+          "length": 10,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "name": {
+          "name": "name",
+          "type": "varchar(20)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "unique": false,
+          "length": 20,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "description": {
+          "name": "description",
+          "type": "varchar(4096)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "unique": false,
+          "length": 4096,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "icon": {
+          "name": "icon",
+          "type": "varchar(255)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": true,
+          "unique": false,
+          "length": 255,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "created_by_id": {
+          "name": "created_by_id",
+          "type": "varchar(10)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "unique": false,
+          "length": 10,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamptz",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "unique": false,
+          "length": 6,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "datetime"
+        }
+      },
+      "name": "community",
+      "schema": "public",
+      "indexes": [
+        {
+          "columnNames": [
+            "name"
+          ],
+          "composite": false,
+          "keyName": "community_name_index",
+          "constraint": false,
+          "primary": false,
+          "unique": false
+        },
+        {
+          "columnNames": [
+            "name"
+          ],
+          "composite": false,
+          "keyName": "community_name_unique",
+          "constraint": true,
+          "primary": false,
+          "unique": true
+        },
+        {
+          "keyName": "community_pkey",
+          "columnNames": [
+            "id"
+          ],
+          "composite": false,
+          "constraint": true,
+          "primary": true,
+          "unique": true
+        }
+      ],
+      "checks": [],
+      "foreignKeys": {
+        "community_created_by_id_foreign": {
+          "constraintName": "community_created_by_id_foreign",
+          "columnNames": [
+            "created_by_id"
+          ],
+          "localTableName": "public.community",
+          "referencedColumnNames": [
+            "id"
+          ],
+          "referencedTableName": "public.user",
+          "updateRule": "cascade"
+        }
+      },
+      "nativeEnums": {}
+    },
+    {
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "varchar(10)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": true,
+          "nullable": false,
+          "unique": false,
+          "length": 10,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "name": {
+          "name": "name",
+          "type": "varchar(20)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "unique": false,
+          "length": 20,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "description": {
+          "name": "description",
+          "type": "varchar(4096)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "unique": false,
+          "length": 4096,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "community_id": {
+          "name": "community_id",
+          "type": "varchar(10)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "unique": false,
+          "length": 10,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "created_by_id": {
+          "name": "created_by_id",
+          "type": "varchar(10)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "unique": false,
+          "length": 10,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamptz",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "unique": false,
+          "length": 6,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "datetime"
+        }
+      },
+      "name": "channel",
+      "schema": "public",
+      "indexes": [
+        {
+          "columnNames": [
+            "name"
+          ],
+          "composite": false,
+          "keyName": "channel_name_index",
+          "constraint": false,
+          "primary": false,
+          "unique": false
+        },
+        {
+          "columnNames": [
+            "name"
+          ],
+          "composite": false,
+          "keyName": "channel_name_unique",
+          "constraint": true,
+          "primary": false,
+          "unique": true
+        },
+        {
+          "keyName": "channel_pkey",
+          "columnNames": [
+            "id"
+          ],
+          "composite": false,
+          "constraint": true,
+          "primary": true,
+          "unique": true
+        }
+      ],
+      "checks": [],
+      "foreignKeys": {
+        "channel_community_id_foreign": {
+          "constraintName": "channel_community_id_foreign",
+          "columnNames": [
+            "community_id"
+          ],
+          "localTableName": "public.channel",
+          "referencedColumnNames": [
+            "id"
+          ],
+          "referencedTableName": "public.community",
+          "updateRule": "cascade"
+        },
+        "channel_created_by_id_foreign": {
+          "constraintName": "channel_created_by_id_foreign",
+          "columnNames": [
+            "created_by_id"
+          ],
+          "localTableName": "public.channel",
+          "referencedColumnNames": [
+            "id"
+          ],
+          "referencedTableName": "public.user",
+          "updateRule": "cascade"
+        }
+      },
+      "nativeEnums": {}
+    },
+    {
+      "columns": {
+        "id": {
+          "name": "id",
+          "type": "varchar(10)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": true,
+          "nullable": false,
+          "unique": false,
+          "length": 10,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "message": {
+          "name": "message",
+          "type": "varchar(4096)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "unique": false,
+          "length": 4096,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "channel_id": {
+          "name": "channel_id",
+          "type": "varchar(10)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "unique": false,
+          "length": 10,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "created_by_id": {
+          "name": "created_by_id",
+          "type": "varchar(10)",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "unique": false,
+          "length": 10,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "string"
+        },
+        "created_at": {
+          "name": "created_at",
+          "type": "timestamptz",
+          "unsigned": false,
+          "autoincrement": false,
+          "primary": false,
+          "nullable": false,
+          "unique": false,
+          "length": 6,
+          "precision": null,
+          "scale": null,
+          "default": null,
+          "comment": null,
+          "enumItems": [],
+          "mappedType": "datetime"
+        }
+      },
+      "name": "message",
+      "schema": "public",
+      "indexes": [
+        {
+          "keyName": "message_pkey",
+          "columnNames": [
+            "id"
+          ],
+          "composite": false,
+          "constraint": true,
+          "primary": true,
+          "unique": true
+        }
+      ],
+      "checks": [],
+      "foreignKeys": {
+        "message_channel_id_foreign": {
+          "constraintName": "message_channel_id_foreign",
+          "columnNames": [
+            "channel_id"
+          ],
+          "localTableName": "public.message",
+          "referencedColumnNames": [
+            "id"
+          ],
+          "referencedTableName": "public.channel",
+          "updateRule": "cascade"
+        },
+        "message_created_by_id_foreign": {
+          "constraintName": "message_created_by_id_foreign",
+          "columnNames": [
+            "created_by_id"
+          ],
+          "localTableName": "public.message",
+          "referencedColumnNames": [
+            "id"
+          ],
+          "referencedTableName": "public.user",
+          "updateRule": "cascade"
+        }
+      },
+      "nativeEnums": {}
     }
   ],
   "nativeEnums": {}
diff --git a/packages/backend/src/migrations/Migration20260602125825.ts b/packages/backend/src/migrations/Migration20260602125825.ts
new file mode 100644
index 0000000..26ad701
--- /dev/null
+++ b/packages/backend/src/migrations/Migration20260602125825.ts
@@ -0,0 +1,54 @@
+import { Migration } from '@mikro-orm/migrations';
+
+export class Migration20260602125825 extends Migration {
+
+  override async up(): Promise<void> {
+    this.addSql(`create table "log" ("id" varchar(10) not null, "text" varchar(4096) not null, "created_by_id" varchar(10) null, "created_at" timestamptz not null, constraint "log_pkey" primary key ("id"));`);
+
+    this.addSql(`create table "community" ("id" varchar(10) not null, "name" varchar(20) not null, "description" varchar(4096) not null, "icon" varchar(255) null, "created_by_id" varchar(10) not null, "created_at" timestamptz not null, constraint "community_pkey" primary key ("id"));`);
+    this.addSql(`create index "community_name_index" on "community" ("name");`);
+    this.addSql(`alter table "community" add constraint "community_name_unique" unique ("name");`);
+
+    this.addSql(`create table "channel" ("id" varchar(10) not null, "name" varchar(20) not null, "description" varchar(4096) not null, "community_id" varchar(10) not null, "created_by_id" varchar(10) not null, "created_at" timestamptz not null, constraint "channel_pkey" primary key ("id"));`);
+    this.addSql(`create index "channel_name_index" on "channel" ("name");`);
+    this.addSql(`alter table "channel" add constraint "channel_name_unique" unique ("name");`);
+
+    this.addSql(`create table "message" ("id" varchar(10) not null, "message" varchar(4096) not null, "channel_id" varchar(10) not null, "created_by_id" varchar(10) not null, "created_at" timestamptz not null, constraint "message_pkey" primary key ("id"));`);
+
+    this.addSql(`alter table "log" add constraint "log_created_by_id_foreign" foreign key ("created_by_id") references "user" ("id") on update cascade on delete set null;`);
+
+    this.addSql(`alter table "community" add constraint "community_created_by_id_foreign" foreign key ("created_by_id") references "user" ("id") on update cascade;`);
+
+    this.addSql(`alter table "channel" add constraint "channel_community_id_foreign" foreign key ("community_id") references "community" ("id") on update cascade;`);
+    this.addSql(`alter table "channel" add constraint "channel_created_by_id_foreign" foreign key ("created_by_id") references "user" ("id") on update cascade;`);
+
+    this.addSql(`alter table "message" add constraint "message_channel_id_foreign" foreign key ("channel_id") references "channel" ("id") on update cascade;`);
+    this.addSql(`alter table "message" add constraint "message_created_by_id_foreign" foreign key ("created_by_id") references "user" ("id") on update cascade;`);
+
+    this.addSql(`alter table "config" alter column "value" type varchar(4096) using ("value"::varchar(4096));`);
+
+    this.addSql(`alter table "user" add column "icon" varchar(255) null;`);
+    this.addSql(`alter table "user" rename column "is_owner" to "is_admin";`);
+  }
+
+  override async down(): Promise<void> {
+    this.addSql(`alter table "channel" drop constraint "channel_community_id_foreign";`);
+
+    this.addSql(`alter table "message" drop constraint "message_channel_id_foreign";`);
+
+    this.addSql(`drop table if exists "log" cascade;`);
+
+    this.addSql(`drop table if exists "community" cascade;`);
+
+    this.addSql(`drop table if exists "channel" cascade;`);
+
+    this.addSql(`drop table if exists "message" cascade;`);
+
+    this.addSql(`alter table "config" alter column "value" type text using ("value"::text);`);
+
+    this.addSql(`alter table "user" drop column "icon";`);
+
+    this.addSql(`alter table "user" rename column "is_admin" to "is_owner";`);
+  }
+
+}