refactor: bake redirects from db (#3186)

- refactor: bake redirects from db
- refactor: resolve internal redirects from db

### Internal redirect resolver

The internal resolver is currently only used for prominent links. The following query reveals some examples of where it might be used:

```
select
    *
from
    posts_links pl
    join posts p on pl.sourceId = p.id
where
    pl.linkType = 'grapher'
    and componentType = 'prominent-link'
    and p.status = 'publish'
    and p.gdocSuccessorId is NULL
    and pl.target in (
        select
            slug
        from
            chart_slug_redirects csr
    )
```

For instance, in https://ourworldindata.org/ukraine-war 

![Screenshot 2024-02-10 at 09.10.18.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/0SFFiIjKuUK6UPYHVe6u/f120f2fc-5e01-4eb2-9990-050ddd0827f8.png)


### formatWpUrl refactor

This PR also simplifies the formatWpUrl function since none of the paths in redirects contain the "__" string:

```
SELECT url, action_data, action_code FROM wp_redirection_items WHERE (url like "%\_\_%" OR action_data like "%\_\_%")  and status = "enabled"
```
--> 0 results

baker/redirects.ts

@@ -1,9 +1,9 @@
 import * as db from "../db/db.js"
-import * as wpdb from "../db/wpdb.js"
 import { memoize, JsonError, Url } from "@ourworldindata/utils"
 import { isCanonicalInternalUrl } from "./formatting.js"
 import { resolveExplorerRedirect } from "./replaceExplorerRedirects.js"
 import { logErrorAndMaybeSendToBugsnag } from "../serverUtils/errorLog.js"
+import { getRedirectsFromDb } from "../db/model/Redirect.js"
 
 export const getRedirects = async () => {
     const staticRedirects = [
@@ -57,22 +57,17 @@ export const getRedirects = async () => {
         "/grapher/exports/* https://assets.ourworldindata.org/grapher/exports/:splat 301",
     ]
 
-    // Redirects from Wordpress admin UI
-    const wpRedirectRows = await wpdb.singleton.query(
-        `SELECT url, action_data, action_code FROM wp_redirection_items WHERE status = 'enabled'`
-    )
-    const wpRedirects = wpRedirectRows.map(
-        (row) =>
-            `${formatWpUrl(row.url)} ${formatWpUrl(row.action_data)} ${
-                row.action_code
-            }`
+    // Get redirects from the database (exported from the Wordpress DB)
+    // Redirects are assumed to be trailing-slash-free (see syncRedirectsToGrapher.ts)
+    const redirectsFromDb = (await getRedirectsFromDb()).map(
+        (row) => `${row.source} ${row.target} ${row.code}`
     )
 
     // Add newlines in between so we get some more overview
     return [
         ...staticRedirects,
         "",
-        ...wpRedirects,
+        ...redirectsFromDb,
         "",
         ...dynamicRedirects, // Cloudflare requires all dynamic redirects to be at the very end of the _redirects file
     ]
@@ -96,25 +91,10 @@ export const getGrapherRedirectsMap = async (
     )
 }
 
-export const formatWpUrl = (url: string) => {
-    if (url === "/") return url
-
-    return url
-        .replace(/__/g, "/") // replace __: abc__xyz -> abc/xyz
-        .replace(/\/$/, "") // remove trailing slash: /abc/ -> /abc
-}
-
 export const getWordpressRedirectsMap = async () => {
-    const wordpressRedirectRows = (await wpdb.singleton.query(
-        `SELECT url, action_data FROM wp_redirection_items WHERE status = 'enabled'`
-    )) as Array<{ url: string; action_data: string }>
+    const redirectsFromDb = await getRedirectsFromDb()
 
-    return new Map(
-        wordpressRedirectRows.map((row) => [
-            formatWpUrl(row.url),
-            formatWpUrl(row.action_data),
-        ])
-    )
+    return new Map(redirectsFromDb.map((row) => [row.source, row.target]))
 }
 
 export const getGrapherAndWordpressRedirectsMap = memoize(

baker/syncRedirectsToGrapher.ts

@@ -1,7 +1,7 @@
 import * as db from "../db/db"
 import * as wpdb from "../db/wpdb"
 import { getRedirectsFromDb } from "../db/model/Redirect.js"
-import { formatWpUrl, resolveRedirectFromMap } from "./redirects.js"
+import { resolveRedirectFromMap } from "./redirects.js"
 import { Redirect, Url } from "@ourworldindata/utils"
 
 // A close cousing of the getWordpressRedirectsMap() function from
@@ -12,13 +12,19 @@ const getWordpressRedirectsMapFromRedirects = (
     return new Map(redirects.map((r) => [r.source, r.target]))
 }
 
+const stripTrailingSlash = (url: string) => {
+    if (url === "/") return url
+
+    return url.replace(/\/$/, "") // remove trailing slash: /abc/ -> /abc
+}
+
 export const syncRedirectsToGrapher = async (): Promise<void> => {
     const allWordpressRedirectsRaw = await wpdb.FOR_SYNC_ONLY_getRedirects()
 
     const allWordpressRedirects = allWordpressRedirectsRaw.map((r) => ({
         ...r,
-        source: formatWpUrl(r.source),
-        target: formatWpUrl(r.target),
+        source: stripTrailingSlash(r.source),
+        target: stripTrailingSlash(r.target),
     }))
 
     const existingRedirectsFromDb = await getRedirectsFromDb()