Add indices for explore and popular

可能会快一点（？

Author: wxh06

prisma/migrations/20231104152326_indices/migration.sql

@@ -0,0 +1,8 @@
+-- CreateIndex
+CREATE INDEX "Post_time_idx" ON "Post"("time");
+
+-- CreateIndex
+CREATE INDEX "Post_replyCount_idx" ON "Post"("replyCount" DESC);
+
+-- CreateIndex
+CREATE INDEX "Reply_time_idx" ON "Reply"("time");

prisma/schema.prisma

@@ -52,6 +52,9 @@ model Post {
   replies    Reply[]
 
   takedown PostTakedown?
+
+  @@index([time])
+  @@index([replyCount(sort: Desc)])
 }
 
 model Reply {
@@ -66,6 +69,7 @@ model Reply {
   takedown  ReplyTakedown?
 
   @@index([postId])
+  @@index([time])
 }
 
 model Activity {