为什么在macOS Catalina 10.15中停止postgresql不起作用

我使用此命令在macOS中停止postgresl，如下所示：

~/source/retire on  master! ⌚ 10:15:00
$ brew services stop postgresql                                                                                                                                ‹ruby-2.7.2›
Stopping `postgresql`... (might take a while)
==> Successfully stopped `postgresql` (label: homebrew.mxcl.postgresql)
(base)

但当我检查流程时，它显示postgresql流程仍然有效：

~/source/retire on  master! ⌚ 10:16:10
$ ps aux|grep postgres                                                                                                                                         ‹ruby-2.7.2›
dolphin          72441   0.0  0.1  8819940  10412   ??  S     2:00PM   0:01.34 /Applications/Visual Studio Code.app/Contents/Frameworks/Code Helper (Renderer).app/Contents/MacOS/Code Helper (Renderer) /Users/dolphin/.vscode/extensions/ckolkman.vscode-postgres-1.1.17/out/language/server.js --node-ipc --clientProcessId=72412
postgres          6412   0.0  0.0  4403696      8   ??  S    30Mar21   0:00.37 /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework/Versions/A/Support/mdworker -s mdworker-sizing -c MDSSizingWorker -m com.apple.mdworker.sizing
postgres           923   0.0  0.0  4366856    288   ??  S    30Mar21   0:00.11 /usr/libexec/secd
postgres           922   0.0  0.0  4396660    536   ??  S    30Mar21   0:00.80 /usr/sbin/distnoted agent
postgres           921   0.0  0.0  4428144   4720   ??  S    30Mar21   0:05.28 /usr/libexec/trustd --agent
postgres           920   0.0  0.0  4430108   1400   ??  S    30Mar21   0:00.35 /usr/libexec/lsd
postgres           919   0.0  0.0  4379124    824   ??  S    30Mar21   0:00.07 /usr/sbin/cfprefsd agent
dolphin           9782   0.0  0.0  4268324    716 s006  S+   10:16AM   0:00.00 grep --color=auto --exclude-dir=.bzr --exclude-dir=CVS --exclude-dir=.git --exclude-dir=.hg --exclude-dir=.svn postgres
postgres          8958   0.0  0.0  4524092   1812   ??  Ss   10:13AM   0:00.00 postgres: logical replication launcher
postgres          8957   0.0  0.0  4378296   1004   ??  Ss   10:13AM   0:00.00 postgres: stats collector
postgres          8956   0.0  0.0  4532284   2076   ??  Ss   10:13AM   0:00.00 postgres: autovacuum launcher
postgres          8955   0.0  0.0  4523900   5280   ??  Ss   10:13AM   0:00.01 postgres: walwriter
postgres          8954   0.0  0.0  4523900   2352   ??  Ss   10:13AM   0:00.03 postgres: background writer
postgres          8953   0.0  0.0  4523900   1100   ??  Ss   10:13AM   0:00.00 postgres: checkpointer
postgres          8945   0.0  0.0  4378296    924   ??  Ss   10:13AM   0:00.00 postgres: logger
postgres          8939   0.0  0.1  4524188  15692   ??  Ss   10:13AM   0:00.03 /Library/PostgreSQL/12/bin/postmaster -D/Library/PostgreSQL/12/data
(base)

为什么这个过程没有退出？我应该如何阻止postgresql