diff --git a/.cursor/skills/actions-and-pg-migration/SKILL.md b/.cursor/skills/actions-and-pg-migration/SKILL.md
new file mode 100644
index 000000000..e3cc6fdb0
--- /dev/null
+++ b/.cursor/skills/actions-and-pg-migration/SKILL.md
@@ -0,0 +1,257 @@
+---
+name: actions-and-pg-migration
+description: Patterns for writing actions (MakeAction/MakeAnonAction), using the Postgres DB (Kysely), and migrating Express routes from MongoDB to Postgres in the Tachi server. Use when adding a new mutation, migrating a Mongo-backed router to Postgres, writing action files, or writing tests for actions or routers.
+---
+
+# Actions & Postgres Migration — Tachi Server
+
+## Actions
+
+### Signatures
+
+All action input/output schemas live in `src/lib/actions/actions.ts`. Add a new entry to `ActionSignatures` (for authenticated actions) or `AnonActionSignatures` (for unauthenticated ones):
+
+```typescript
+// src/lib/actions/actions.ts
+MY_ACTION: {
+    input: z.object({ ... }),
+    output: z.object({ ... }),
+},
+```
+
+### Action files
+
+Place the implementation in `src/actions/my-action.ts`. Always use `.js` extensions on imports (the package uses ESM):
+
+```typescript
+import { MakeAction } from "#lib/actions/actions.js";
+import DB from "#services/pg/db.js";
+import { ExpectedErr } from "bliss";
+
+export const ACTION_MyAction = MakeAction(
+    "MY_ACTION",
+    async (taker, { fieldA, fieldB }) => {
+        // taker.acct.id  — authenticated user's numeric ID
+        // taker.acct.username — their username
+        // taker.ip — request IP (for audit log)
+
+        if (somethingWrong) {
+            throw new ExpectedErr(400, "Human-readable reason.");
+        }
+
+        await DB.insertInto("priv_some_table").values({ ... }).execute();
+
+        return { result: "value" }; // must match output schema
+    },
+);
+```
+
+`MakeAction` automatically writes an `action` row (`kind`, `result: "GOOD"|"BAD"`, `ip`, `user_id`) to the `action` audit table on every call. `MakeAnonAction` is the same but `taker` only has `ip` (no `acct`).
+
+### ExpectedErr
+
+`ExpectedErr(code, reason)` is an intentional control-flow error. Throw it for 400/403/404/409 etc. The global Express error handler in `server.ts` (`MAIN_ERR_HANDLER`) catches it and returns `{ success: false, description: reason }` with the right HTTP status. **Never wrap action calls in `try/catch`** — let it propagate.
+
+### Calling actions from a router
+
+```typescript
+// taker construction — same pattern everywhere:
+const user = req.session.tachi?.user;
+if (!user) return res.status(401).json({ success: false, description: "..." });
+
+const taker = { ip: req.ip, acct: { id: user.id, username: user.username } };
+
+// No try/catch — errors reach MAIN_ERR_HANDLER automatically
+const result = await ACTION_MyAction(taker, { fieldA: body.fieldA });
+
+return res.status(200).json({ success: true, description: "...", body: result });
+```
+
+---
+
+## Postgres / Kysely
+
+### DB import
+
+```typescript
+import DB from "#services/pg/db";          // routers / utils
+import DB from "#services/pg/db.js";       // action files (ESM)
+```
+
+`DB` is a typed `Kysely<Database>` instance. Types come from the generated `tachi-db` workspace package (`src/generated/public/Priv*.ts`).
+
+### Table naming
+
+Postgres tables use `snake_case`. Private/sensitive tables are prefixed `priv_`. Permissions are sparse boolean columns named `pm_<permission_name>`.
+
+| Concept | Mongo | Postgres |
+|---|---|---|
+| API clients | `api-clients` | `priv_api_client` |
+| API tokens | `api-tokens` | `priv_api_token` |
+| Users | `users` | `account` |
+
+### Column lists & document mappers
+
+Reusable `SELECT_*` arrays and `To*Document` mappers live in `src/lib/db-formats/`. Use them to avoid repetition and keep types consistent:
+
+```typescript
+import { SELECT_API_CLIENT, ToAPIClientDocument } from "#lib/db-formats/api-client";
+
+const rows = await DB.selectFrom("priv_api_client")
+    .select(SELECT_API_CLIENT)
+    .where("author", "=", userId)
+    .execute();
+
+const docs = rows.map(ToAPIClientDocument); // → TachiAPIClientDocument[]
+```
+
+`SELECT_API_CLIENT` includes `client_secret`. For public-facing lookups, strip it after fetching:
+
+```typescript
+const { clientSecret: _secret, ...publicDoc } = doc;
+```
+
+### Common query patterns
+
+```typescript
+// Select one
+await DB.selectFrom("priv_api_client")
+    .select(["client_id", "author"])
+    .where("client_id", "=", id)
+    .executeTakeFirst(); // returns undefined if not found
+
+// Insert
+await DB.insertInto("priv_api_client").values({ ... }).execute();
+
+// Update (fetch after separately — don't use .returning() with prefixed column lists)
+await DB.updateTable("priv_api_client").set({ name: "New" }).where("client_id", "=", id).execute();
+const updated = await GetClientByID(id); // re-fetch via existing query helper
+
+// Delete
+await DB.deleteFrom("priv_api_token").where("from_oauth2_client", "=", id).execute();
+
+// Count
+const { count } = await DB.selectFrom("priv_api_client")
+    .select(DB.fn.countAll().as("count"))
+    .where("author", "=", userId)
+    .executeTakeFirstOrThrow();
+```
+
+Existing query helpers (e.g. `GetClientByID`) live in `src/utils/queries/`. Use them in routers; actions can query directly.
+
+---
+
+## Migrating a Mongo-backed router to Postgres
+
+### Checklist
+
+1. **Identify Mongo collections** → find the equivalent `priv_*` Postgres table.
+2. **Reads** — replace `MONGODB_KILL["collection"].find/findOne()` with Kysely selects. Use the existing `SELECT_*` + `To*Document` helpers from `src/lib/db-formats/`.
+3. **Mutations** — extract each write operation into a `MakeAction`-wrapped file in `src/actions/`. Add its signature to `ActionSignatures` in `actions.ts`.
+4. **Middleware** — update any middleware that does Mongo lookups (e.g. `GetClientFromID`) to use a query helper or direct Kysely query.
+5. **Remove Mongo import** — `MONGODB_KILL` should be gone from the file.
+6. **Ownership checks** — move them inside the action (`taker.acct.id === row.author`) rather than in Express middleware, so the action is self-contained.
+7. **Error handler** — throw `ExpectedErr` instead of returning early; no `try/catch` in routes needed.
+
+### Permission columns
+
+Mongo stored permissions as an array. Postgres uses individual nullable boolean columns (`pm_submit_score`, `pm_customise_profile`, etc.). Convert with:
+
+```typescript
+// array → columns
+perms.includes("submit_score") ? true : null   // null = permission not granted
+
+// columns → array (see ToAPIClientDocument for full example)
+if (row.pm_submit_score) result.push("submit_score");
+```
+
+---
+
+## Testing
+
+### Framework & setup
+
+- **Vitest** + colocated `*.test.ts` files (not `__tests__/` folders)
+- Each test worker gets its own DB, truncated between every test via `vitest.setup.ts`
+- Run with `bun run test`
+
+### Action tests (unit-style)
+
+```typescript
+import { seedUser } from "#test-utils/pg-fixtures";
+import { seedApiClient } from "./test-utils/api-tokens";
+
+describe("ACTION_MyAction", () => {
+    let userId: number;
+    let username: string;
+
+    beforeEach(async () => {
+        ({ id: userId, username } = await seedUser({ username: "test_user" }));
+    });
+
+    it("throws 404 when resource does not exist", async () => {
+        const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
+        await expect(ACTION_MyAction(taker, { id: "missing" }))
+            .rejects.toMatchObject({ code: 404 });
+    });
+
+    it("writes a GOOD action row on success", async () => {
+        const taker = { ip: "10.0.0.1", acct: { id: userId, username } };
+        await ACTION_MyAction(taker, { ... });
+
+        const row = await DB.selectFrom("action")
+            .selectAll()
+            .where("kind", "=", "MY_ACTION")
+            .executeTakeFirstOrThrow();
+
+        expect(row).toMatchObject({ result: "GOOD", ip: "10.0.0.1", user_id: userId });
+    });
+});
+```
+
+### Router integration tests
+
+```typescript
+import mockApi, { CloseServerConnection } from "#test-utils/mock-api";
+import { seedUser } from "#test-utils/pg-fixtures";
+
+afterAll(() => CloseServerConnection());
+
+async function loginAs(username: string, password = "password123") {
+    const res = await mockApi.post("/api/v1/auth/login").send({
+        username, "!password": password, captcha: "test",
+    });
+    return res.headers["set-cookie"] as unknown as string[];
+}
+
+describe("POST /api/v1/some/route", () => {
+    let cookie: string[];
+
+    beforeEach(async () => {
+        await seedUser({ username: "test_user", withCredential: true, withSettings: true });
+        cookie = await loginAs("test_user");
+    });
+
+    it("returns 401 when not authenticated", async () => {
+        const res = await mockApi.post("/api/v1/some/route").send({ ... });
+        expect(res.status).toBe(401);
+    });
+
+    it("returns 200 on success", async () => {
+        const res = await mockApi.post("/api/v1/some/route")
+            .set("Cookie", cookie)
+            .send({ ... });
+        expect(res.status).toBe(200);
+        expect(res.body.success).toBe(true);
+    });
+});
+```
+
+### Key test fixtures
+
+| Helper | Source | Purpose |
+|---|---|---|
+| `seedUser(opts?)` | `#test-utils/pg-fixtures` | Insert `account` row; `withCredential` + `withSettings` needed for login |
+| `seedApiClient(opts)` | `src/actions/test-utils/api-tokens` | Insert `priv_api_client` row |
+| `seedApiToken(opts)` | `src/actions/test-utils/api-tokens` | Insert `priv_api_token` row |
+| `getApiToken(token)` | `src/actions/test-utils/api-tokens` | Select a token row by value |
diff --git a/.cursor/skills/db-formats/SKILL.md b/.cursor/skills/db-formats/SKILL.md
new file mode 100644
index 000000000..9c2173d85
--- /dev/null
+++ b/.cursor/skills/db-formats/SKILL.md
@@ -0,0 +1,132 @@
+---
+name: db-formats
+description: Guidance on using db-formats/ column lists (SELECT_*) and document mappers (To*Document) instead of selectAll() when writing Postgres-backed endpoints in the Tachi server. Use when writing a new endpoint that reads from a Postgres table, adding a new db-formats file, or when working with Kysely selects that need to return API-compatible (v1-mongodb-like) response shapes.
+---
+
+# db-formats: Column Lists & Document Mappers
+
+## Why not `.selectAll()`
+
+`.selectAll()` is banned in endpoint code because it:
+
+- Returns raw snake_case Postgres column names directly to API consumers (breaks the v1 MongoDB-compatible contract)
+- Over-fetches columns (e.g. `client_secret` on a public endpoint, internal credential columns)
+- Gives no compile-time guarantee that the row shape matches the `tachi-common` document type
+
+**Exceptions** where `.selectAll()` is fine:
+- Internal/private lookups that never reach API responses (e.g. `priv_account_credential` for password verification)
+- Assertions on audit rows in tests (`DB.selectFrom("action").selectAll()...`)
+
+---
+
+## The pattern
+
+Every Postgres table that is returned through the API needs two things in `src/lib/db-formats/<table>.ts`:
+
+1. **`SELECT_*`** — a `const` array of `"table.column"` strings listing exactly the columns needed
+2. **`To*Document`** — a mapper function that converts a typed Kysely row to the matching `tachi-common` document type
+
+```typescript
+// src/lib/db-formats/my-table.ts
+import { type Selection } from "kysely";
+import { type MyDocument } from "tachi-common";
+import { type Database } from "tachi-db";
+
+export const SELECT_MY_TABLE = [
+    "my_table.user_id",
+    "my_table.some_column",
+] as const;
+
+export function ToMyDocument(
+    row: Selection<Database, "my_table", (typeof SELECT_MY_TABLE)[number]>,
+): MyDocument {
+    return {
+        userID: row.user_id,         // snake_case → camelCase
+        someColumn: row.some_column,
+    };
+}
+```
+
+The `Selection<Database, "table", (typeof SELECT_*)[number]>` type ensures the mapper only receives columns that were actually selected — Kysely will error at compile time if the select array and mapper fall out of sync.
+
+---
+
+## Using it in an endpoint
+
+```typescript
+import { SELECT_MY_TABLE, ToMyDocument } from "#lib/db-formats/my-table";
+
+// Many rows
+const rows = await DB.selectFrom("my_table")
+    .select(SELECT_MY_TABLE)
+    .where("user_id", "=", userId)
+    .execute();
+
+return res.status(200).json({
+    success: true,
+    description: "...",
+    body: rows.map(ToMyDocument),
+});
+
+// Single row
+const row = await DB.selectFrom("my_table")
+    .select(SELECT_MY_TABLE)
+    .where("user_id", "=", userId)
+    .executeTakeFirst();
+
+return res.status(200).json({
+    success: true,
+    description: "...",
+    body: row ? ToMyDocument(row) : null,
+});
+```
+
+---
+
+## v1-MongoDB-compatible mapping conventions
+
+The `To*Document` function is responsible for all shape translation. Common patterns:
+
+| Postgres column type | API document shape | Example |
+|---|---|---|
+| `snake_case` columns | `camelCase` fields | `user_id` → `userID`, `client_id` → `clientID` |
+| `ISO 8601` timestamp string | Unix milliseconds (`number`) | `ISO8601ToUnixMilliseconds(row.joined)` → `joinDate` |
+| `pm_*` nullable boolean columns | Array or permissions object | `if (row.pm_submit_score) perms.push("submit_score")` |
+| `bd_*` boolean badge columns | `badges: UserBadges[]` array | `if (row.bd_alpha) badges.push("alpha")` |
+| `sm_*` social media columns | `socialMedia: { ... }` object | `{ discord: row.sm_discord, ... }` |
+| V3 combined game column | `{ game, playtype }` split | `V3ToGamePT(row.game)` |
+| `auth_level` enum string | `authLevel: number` | `AuthLevelToInt(row.auth_level)` |
+
+---
+
+## Stripping sensitive columns on public endpoints
+
+`SELECT_API_CLIENT` includes `client_secret`. If the endpoint is public-facing (not the client owner), strip it after mapping:
+
+```typescript
+const { clientSecret: _secret, ...publicDoc } = ToAPIClientDocument(row);
+```
+
+---
+
+## Adding a new db-formats file: checklist
+
+1. Create `src/lib/db-formats/<table>.ts`
+2. Export `SELECT_<TABLE>` as a `const` array of `"table.column"` strings (use the qualified `table.column` form, not bare column names, to avoid ambiguity in joins)
+3. Export `To<Entity>Document` typed with `Selection<Database, "table", (typeof SELECT_<TABLE>)[number]>`
+4. Return the matching `tachi-common` document type (import from `"tachi-common"`)
+5. Apply all naming/shape conventions from the table above
+6. Import and use `SELECT_*` + `To*Document` in the router/util — never `.selectAll()`
+
+---
+
+## Existing db-formats files
+
+| File | Table | Document type |
+|---|---|---|
+| `api-client.ts` | `priv_api_client` | `TachiAPIClientDocument` |
+| `api-token.ts` | `priv_api_token` | `APITokenDocument` |
+| `user.ts` | `account` | `UserDocument` |
+| `user-settings.ts` | `account_settings` | `UserSettingsDocument` |
+| `game-stats.ts` | `game_stats` | `UserGameStats` |
+| `kshook-sv6c-settings.ts` | `svc_kshook_sv6c_settings` | `KsHookSettingsDocument` |
diff --git a/typescript/bliss/src/actions.ts b/typescript/bliss/src/actions.ts
index 9501d7ab8..e208181d5 100644
--- a/typescript/bliss/src/actions.ts
+++ b/typescript/bliss/src/actions.ts
@@ -67,11 +67,15 @@ export function MakeActionGuts({
 	appName,
 	kind,
 	fn: actionBodyFn,
+	inputSchema,
+	outputSchema,
 }: {
 	appName: string;
 	db: any;
 	fn: (taker: ActionTaker | AnonActionTaker, input: object) => Promise<object>;
+	inputSchema: ZodObject;
 	kind: string;
+	outputSchema: ZodObject;
 }): unknown {
 	return async (taker: ActionTaker | AnonActionTaker, input: Record<string, unknown>) => {
 		const ts_start = new Date();
@@ -88,8 +92,25 @@ export function MakeActionGuts({
 		log.debug({ input: OmitPrivate(input) }, "Action started");
 
 		try {
+			const inputParsed = inputSchema.safeParse(input);
+
+			if (!inputParsed.success) {
+				throw new Error(
+					`Action ${kind} received invalid input: ${inputParsed.error.message}`,
+				);
+			}
+
 			retval = await actionBodyFn(taker, input);
 
+			const outputParsed = outputSchema.safeParse(retval);
+
+			if (!outputParsed.success) {
+				log.error(
+					{ errors: outputParsed.error.issues, output: OmitPrivate(retval ?? {}) },
+					`Action ${kind} returned invalid output`,
+				);
+			}
+
 			outputJSON = JSON.stringify(OmitPrivate(retval ?? {}));
 			log.debug(
 				{ input: OmitPrivate(input), output: OmitPrivate(retval ?? {}) },
diff --git a/typescript/eslint-config/index.js b/typescript/eslint-config/index.js
index d8e09967d..b0c2c9a36 100644
--- a/typescript/eslint-config/index.js
+++ b/typescript/eslint-config/index.js
@@ -1,4 +1,4 @@
-import eslint from "@eslint";
+import eslint from "@eslint/js";
 import configPrettier from "eslint-config-prettier";
 import pluginImport from "eslint-plugin-import";
 import pluginJsxA11y from "eslint-plugin-jsx-a11y";
diff --git a/typescript/server/src/actions/change-email.test.ts b/typescript/server/src/actions/change-email.test.ts
index 5d226ff3f..e881e82f6 100644
--- a/typescript/server/src/actions/change-email.test.ts
+++ b/typescript/server/src/actions/change-email.test.ts
@@ -193,7 +193,9 @@ describe("ACTION_ChangeEmail", () => {
 		});
 
 		beforeEach(() => {
-			(ServerConfig as Record<string, unknown>).EMAIL_CONFIG = { FROM: "noreply@example.com" };
+			(ServerConfig as Record<string, unknown>).EMAIL_CONFIG = {
+				FROM: "noreply@example.com",
+			};
 		});
 
 		it("inserts a verify-email token for the new address", async () => {
diff --git a/typescript/server/src/actions/change-pfp.test.ts b/typescript/server/src/actions/change-pfp.test.ts
index 8d8c38f52..0275fbd84 100644
--- a/typescript/server/src/actions/change-pfp.test.ts
+++ b/typescript/server/src/actions/change-pfp.test.ts
@@ -164,7 +164,12 @@ describe("ACTION_ChangePfp", () => {
 			.where("kind", "=", "CHANGE_PFP")
 			.executeTakeFirstOrThrow();
 
-		expect(action).toMatchObject({ kind: "CHANGE_PFP", result: "GOOD", ip: "10.0.0.1", user_id: userId });
+		expect(action).toMatchObject({
+			kind: "CHANGE_PFP",
+			result: "GOOD",
+			ip: "10.0.0.1",
+			user_id: userId,
+		});
 	});
 
 	it("writes a BAD action row on invalid mimetype", async () => {
@@ -285,7 +290,12 @@ describe("ACTION_DeletePfp", () => {
 			.where("kind", "=", "DELETE_PFP")
 			.executeTakeFirstOrThrow();
 
-		expect(action).toMatchObject({ kind: "DELETE_PFP", result: "GOOD", ip: "10.0.0.1", user_id: userId });
+		expect(action).toMatchObject({
+			kind: "DELETE_PFP",
+			result: "GOOD",
+			ip: "10.0.0.1",
+			user_id: userId,
+		});
 	});
 });
 
@@ -348,7 +358,10 @@ describe("ACTION_ChangeBanner", () => {
 	it("persists the content hash to custom_banner_location", async () => {
 		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
 
-		await ACTION_ChangeBanner(taker, { "!fileBuffer": JPEG_BUFFER, fileMimetype: "image/jpeg" });
+		await ACTION_ChangeBanner(taker, {
+			"!fileBuffer": JPEG_BUFFER,
+			fileMimetype: "image/jpeg",
+		});
 
 		expect(await getBannerLocation(userId)).toBe(HashSHA256(JPEG_BUFFER));
 	});
@@ -357,7 +370,10 @@ describe("ACTION_ChangeBanner", () => {
 		const other = await seedUser({ username: "other_user" });
 		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
 
-		await ACTION_ChangeBanner(taker, { "!fileBuffer": JPEG_BUFFER, fileMimetype: "image/jpeg" });
+		await ACTION_ChangeBanner(taker, {
+			"!fileBuffer": JPEG_BUFFER,
+			fileMimetype: "image/jpeg",
+		});
 
 		expect(await getBannerLocation(other.id)).toBeNull();
 	});
@@ -377,7 +393,10 @@ describe("ACTION_ChangeBanner", () => {
 	it("calls CDNStoreOrOverwrite with the correct URL and buffer", async () => {
 		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
 
-		await ACTION_ChangeBanner(taker, { "!fileBuffer": JPEG_BUFFER, fileMimetype: "image/jpeg" });
+		await ACTION_ChangeBanner(taker, {
+			"!fileBuffer": JPEG_BUFFER,
+			fileMimetype: "image/jpeg",
+		});
 
 		expect(CDNStoreOrOverwrite).toHaveBeenCalledOnce();
 		expect(CDNStoreOrOverwrite).toHaveBeenCalledWith(
@@ -391,14 +410,22 @@ describe("ACTION_ChangeBanner", () => {
 	it("writes a GOOD action row on success", async () => {
 		const taker = { ip: "10.0.0.1", acct: { id: userId, username } };
 
-		await ACTION_ChangeBanner(taker, { "!fileBuffer": JPEG_BUFFER, fileMimetype: "image/jpeg" });
+		await ACTION_ChangeBanner(taker, {
+			"!fileBuffer": JPEG_BUFFER,
+			fileMimetype: "image/jpeg",
+		});
 
 		const action = await DB.selectFrom("action")
 			.selectAll()
 			.where("kind", "=", "CHANGE_BANNER")
 			.executeTakeFirstOrThrow();
 
-		expect(action).toMatchObject({ kind: "CHANGE_BANNER", result: "GOOD", ip: "10.0.0.1", user_id: userId });
+		expect(action).toMatchObject({
+			kind: "CHANGE_BANNER",
+			result: "GOOD",
+			ip: "10.0.0.1",
+			user_id: userId,
+		});
 	});
 
 	it("writes a BAD action row on invalid mimetype", async () => {
@@ -419,7 +446,10 @@ describe("ACTION_ChangeBanner", () => {
 	it("does not store the file buffer content in the audit log input", async () => {
 		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
 
-		await ACTION_ChangeBanner(taker, { "!fileBuffer": JPEG_BUFFER, fileMimetype: "image/jpeg" });
+		await ACTION_ChangeBanner(taker, {
+			"!fileBuffer": JPEG_BUFFER,
+			fileMimetype: "image/jpeg",
+		});
 
 		const action = await DB.selectFrom("action")
 			.select("input")
@@ -519,6 +549,11 @@ describe("ACTION_DeleteBanner", () => {
 			.where("kind", "=", "DELETE_BANNER")
 			.executeTakeFirstOrThrow();
 
-		expect(action).toMatchObject({ kind: "DELETE_BANNER", result: "GOOD", ip: "10.0.0.1", user_id: userId });
+		expect(action).toMatchObject({
+			kind: "DELETE_BANNER",
+			result: "GOOD",
+			ip: "10.0.0.1",
+			user_id: userId,
+		});
 	});
 });
diff --git a/typescript/server/src/actions/change-username.test.ts b/typescript/server/src/actions/change-username.test.ts
index 889bdc994..fd99d3ef9 100644
--- a/typescript/server/src/actions/change-username.test.ts
+++ b/typescript/server/src/actions/change-username.test.ts
@@ -12,7 +12,7 @@ import { ACTION_ChangeUsername } from "./change-username";
  */
 async function seedUsernameChange(
 	userId: number,
-	opts: { ageDays?: number; username?: string; previousUsername?: string } = {},
+	opts: { ageDays?: number; previousUsername?: string; username?: string } = {},
 ) {
 	const ageDays = opts.ageDays ?? 0;
 	const timestamp = new Date(Date.now() - ageDays * 24 * 60 * 60 * 1000).toISOString();
@@ -73,7 +73,10 @@ describe("ACTION_ChangeUsername", () => {
 		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
 
 		await expect(
-			ACTION_ChangeUsername(taker, { newUsername: "new_username", "!password": "wrongpassword" }),
+			ACTION_ChangeUsername(taker, {
+				newUsername: "new_username",
+				"!password": "wrongpassword",
+			}),
 		).rejects.toMatchObject({ code: 401 });
 	});
 
@@ -81,7 +84,10 @@ describe("ACTION_ChangeUsername", () => {
 		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
 
 		await expect(
-			ACTION_ChangeUsername(taker, { newUsername: "new_username", "!password": "wrongpassword" }),
+			ACTION_ChangeUsername(taker, {
+				newUsername: "new_username",
+				"!password": "wrongpassword",
+			}),
 		).rejects.toThrow();
 
 		const action = await DB.selectFrom("action")
@@ -96,7 +102,10 @@ describe("ACTION_ChangeUsername", () => {
 		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
 
 		await expect(
-			ACTION_ChangeUsername(taker, { newUsername: "new_username", "!password": "wrongpassword" }),
+			ACTION_ChangeUsername(taker, {
+				newUsername: "new_username",
+				"!password": "wrongpassword",
+			}),
 		).rejects.toThrow();
 
 		const row = await DB.selectFrom("account")
diff --git a/typescript/server/src/actions/create-api-client.test.ts b/typescript/server/src/actions/create-api-client.test.ts
index f09b2e0c9..80df1aa8d 100644
--- a/typescript/server/src/actions/create-api-client.test.ts
+++ b/typescript/server/src/actions/create-api-client.test.ts
@@ -3,8 +3,8 @@ import DB from "#services/pg/db";
 import { seedUser } from "#test-utils/pg-fixtures";
 import { beforeEach, describe, expect, it } from "vitest";
 
-import { seedApiClient } from "./test-utils/api-tokens";
 import { ACTION_CreateApiClient } from "./create-api-client";
+import { seedApiClient } from "./test-utils/api-tokens";
 
 // ─── ACTION_CreateApiClient ───────────────────────────────────────────────────
 
diff --git a/typescript/server/src/actions/create-api-client.ts b/typescript/server/src/actions/create-api-client.ts
index 622cc58f6..8e82d828a 100644
--- a/typescript/server/src/actions/create-api-client.ts
+++ b/typescript/server/src/actions/create-api-client.ts
@@ -23,7 +23,10 @@ function permissionsToColumns(perms: Array<APIPermissions>) {
 
 export const ACTION_CreateApiClient = MakeAction(
 	"CREATE_API_CLIENT",
-	async (taker, { name, redirectUri, webhookUri, apiKeyTemplate, apiKeyFilename, permissions }) => {
+	async (
+		taker,
+		{ name, redirectUri, webhookUri, apiKeyTemplate, apiKeyFilename, permissions },
+	) => {
 		const permissions_deduped = DedupeArr(permissions) as Array<APIPermissions>;
 
 		const invalid = permissions_deduped.filter((p) => !VALID_PERMISSIONS.has(p));
diff --git a/typescript/server/src/actions/create-api-token.test.ts b/typescript/server/src/actions/create-api-token.test.ts
index 71b442400..ddbc80e0d 100644
--- a/typescript/server/src/actions/create-api-token.test.ts
+++ b/typescript/server/src/actions/create-api-token.test.ts
@@ -2,8 +2,8 @@ import DB from "#services/pg/db";
 import { seedUser } from "#test-utils/pg-fixtures";
 import { beforeEach, describe, expect, it } from "vitest";
 
-import { getApiToken, seedApiClient, seedApiToken } from "./test-utils/api-tokens";
 import { ACTION_CreateApiToken } from "./create-api-token";
+import { getApiToken, seedApiClient, seedApiToken } from "./test-utils/api-tokens";
 
 // ─── ACTION_CreateApiToken ────────────────────────────────────────────────────
 
@@ -68,9 +68,7 @@ describe("ACTION_CreateApiToken", () => {
 	it("writes a BAD action row when the clientID does not exist", async () => {
 		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
 
-		await expect(
-			ACTION_CreateApiToken(taker, { clientID: "CXNonExistent" }),
-		).rejects.toThrow();
+		await expect(ACTION_CreateApiToken(taker, { clientID: "CXNonExistent" })).rejects.toThrow();
 
 		const action = await DB.selectFrom("action")
 			.select("result")
diff --git a/typescript/server/src/actions/create-api-token.ts b/typescript/server/src/actions/create-api-token.ts
index 7b4525f9e..090cae478 100644
--- a/typescript/server/src/actions/create-api-token.ts
+++ b/typescript/server/src/actions/create-api-token.ts
@@ -23,10 +23,7 @@ export const ACTION_CreateApiToken = MakeAction(
 	"CREATE_API_TOKEN",
 	async (taker, { clientID, permissions, identifier }) => {
 		if (clientID !== undefined && permissions !== undefined) {
-			throw new ExpectedErr(
-				400,
-				"Cannot use clientID and permissions at the same time.",
-			);
+			throw new ExpectedErr(400, "Cannot use clientID and permissions at the same time.");
 		}
 
 		let tokenIdentifier: string;
diff --git a/typescript/server/src/actions/delete-all-notifications.test.ts b/typescript/server/src/actions/delete-all-notifications.test.ts
index de42cea4a..3632b906c 100644
--- a/typescript/server/src/actions/delete-all-notifications.test.ts
+++ b/typescript/server/src/actions/delete-all-notifications.test.ts
@@ -3,12 +3,12 @@ import DB from "#services/pg/db";
 import { seedUser } from "#test-utils/pg-fixtures";
 import { beforeEach, describe, expect, it } from "vitest";
 
+import { ACTION_DeleteAllNotifications } from "./delete-all-notifications";
 import {
 	countNotificationsForUser,
 	getNotification,
 	seedNotification,
 } from "./test-utils/notifications";
-import { ACTION_DeleteAllNotifications } from "./delete-all-notifications";
 
 // ─── ACTION_DeleteAllNotifications ───────────────────────────────────────────
 
diff --git a/typescript/server/src/actions/delete-api-client.test.ts b/typescript/server/src/actions/delete-api-client.test.ts
index 66597e501..fc1e4bfbf 100644
--- a/typescript/server/src/actions/delete-api-client.test.ts
+++ b/typescript/server/src/actions/delete-api-client.test.ts
@@ -2,8 +2,8 @@ import DB from "#services/pg/db";
 import { seedUser } from "#test-utils/pg-fixtures";
 import { beforeEach, describe, expect, it } from "vitest";
 
-import { seedApiClient, seedApiToken } from "./test-utils/api-tokens";
 import { ACTION_DeleteApiClient } from "./delete-api-client";
+import { seedApiClient, seedApiToken } from "./test-utils/api-tokens";
 
 // ─── ACTION_DeleteApiClient ───────────────────────────────────────────────────
 
@@ -31,9 +31,9 @@ describe("ACTION_DeleteApiClient", () => {
 		const { id: otherId, username: otherUsername } = await seedUser({ username: "other_user" });
 		const taker = { ip: "127.0.0.1", acct: { id: otherId, username: otherUsername } };
 
-		await expect(
-			ACTION_DeleteApiClient(taker, { clientID: clientId }),
-		).rejects.toMatchObject({ code: 403 });
+		await expect(ACTION_DeleteApiClient(taker, { clientID: clientId })).rejects.toMatchObject({
+			code: 403,
+		});
 	});
 
 	// ── Happy path ────────────────────────────────────────────────────────────
@@ -70,7 +70,11 @@ describe("ACTION_DeleteApiClient", () => {
 	it("does not remove tokens belonging to other clients", async () => {
 		const { id: otherId } = await seedUser({ username: "other_user" });
 		await seedApiClient({ clientId: "CIOtherClient", authorId: otherId });
-		await seedApiToken({ token: "T_other_token", userId: otherId, fromClient: "CIOtherClient" });
+		await seedApiToken({
+			token: "T_other_token",
+			userId: otherId,
+			fromClient: "CIOtherClient",
+		});
 
 		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
 
diff --git a/typescript/server/src/actions/delete-api-client.ts b/typescript/server/src/actions/delete-api-client.ts
index 8eec082aa..cf5b3a35b 100644
--- a/typescript/server/src/actions/delete-api-client.ts
+++ b/typescript/server/src/actions/delete-api-client.ts
@@ -18,9 +18,7 @@ export const ACTION_DeleteApiClient = MakeAction(
 			throw new ExpectedErr(403, "You are not authorized to perform this action.");
 		}
 
-		await DB.deleteFrom("priv_api_token")
-			.where("from_oauth2_client", "=", clientID)
-			.execute();
+		await DB.deleteFrom("priv_api_token").where("from_oauth2_client", "=", clientID).execute();
 
 		await DB.deleteFrom("priv_api_client").where("client_id", "=", clientID).execute();
 
diff --git a/typescript/server/src/actions/delete-api-token.test.ts b/typescript/server/src/actions/delete-api-token.test.ts
index 520ed584d..f7b73f3c8 100644
--- a/typescript/server/src/actions/delete-api-token.test.ts
+++ b/typescript/server/src/actions/delete-api-token.test.ts
@@ -2,8 +2,8 @@ import DB from "#services/pg/db";
 import { seedUser } from "#test-utils/pg-fixtures";
 import { beforeEach, describe, expect, it } from "vitest";
 
-import { getApiToken, seedApiToken } from "./test-utils/api-tokens";
 import { ACTION_DeleteApiToken } from "./delete-api-token";
+import { getApiToken, seedApiToken } from "./test-utils/api-tokens";
 
 // ─── ACTION_DeleteApiToken ────────────────────────────────────────────────────
 
@@ -30,9 +30,9 @@ describe("ACTION_DeleteApiToken", () => {
 		await seedApiToken({ token: "OTHER_TOKEN", userId: other.id });
 		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
 
-		await expect(
-			ACTION_DeleteApiToken(taker, { token: "OTHER_TOKEN" }),
-		).rejects.toMatchObject({ code: 404 });
+		await expect(ACTION_DeleteApiToken(taker, { token: "OTHER_TOKEN" })).rejects.toMatchObject({
+			code: 404,
+		});
 	});
 
 	it("writes a BAD action row when the token does not exist", async () => {
diff --git a/typescript/server/src/actions/delete-api-token.ts b/typescript/server/src/actions/delete-api-token.ts
index ec11150b3..a283ccdc5 100644
--- a/typescript/server/src/actions/delete-api-token.ts
+++ b/typescript/server/src/actions/delete-api-token.ts
@@ -2,21 +2,18 @@ import { MakeAction } from "#lib/actions/actions.js";
 import DB from "#services/pg/db.js";
 import { ExpectedErr } from "bliss";
 
-export const ACTION_DeleteApiToken = MakeAction(
-	"DELETE_API_TOKEN",
-	async (taker, { token }) => {
-		const existing = await DB.selectFrom("priv_api_token")
-			.select("token")
-			.where("token", "=", token)
-			.where("user_id", "=", taker.acct.id)
-			.executeTakeFirst();
+export const ACTION_DeleteApiToken = MakeAction("DELETE_API_TOKEN", async (taker, { token }) => {
+	const existing = await DB.selectFrom("priv_api_token")
+		.select("token")
+		.where("token", "=", token)
+		.where("user_id", "=", taker.acct.id)
+		.executeTakeFirst();
 
-		if (!existing) {
-			throw new ExpectedErr(404, "This key does not exist.");
-		}
+	if (!existing) {
+		throw new ExpectedErr(404, "This key does not exist.");
+	}
 
-		await DB.deleteFrom("priv_api_token").where("token", "=", token).execute();
+	await DB.deleteFrom("priv_api_token").where("token", "=", token).execute();
 
-		return {};
-	},
-);
+	return {};
+});
diff --git a/typescript/server/src/actions/mark-all-notifications-read.test.ts b/typescript/server/src/actions/mark-all-notifications-read.test.ts
index 19cdcd709..345794e55 100644
--- a/typescript/server/src/actions/mark-all-notifications-read.test.ts
+++ b/typescript/server/src/actions/mark-all-notifications-read.test.ts
@@ -3,8 +3,8 @@ import DB from "#services/pg/db";
 import { seedUser } from "#test-utils/pg-fixtures";
 import { beforeEach, describe, expect, it } from "vitest";
 
-import { getNotification, seedNotification } from "./test-utils/notifications";
 import { ACTION_MarkAllNotificationsRead } from "./mark-all-notifications-read";
+import { getNotification, seedNotification } from "./test-utils/notifications";
 
 // ─── ACTION_MarkAllNotificationsRead ─────────────────────────────────────────
 
diff --git a/typescript/server/src/actions/reset-api-client-secret.test.ts b/typescript/server/src/actions/reset-api-client-secret.test.ts
index 817294ec2..8f82447a2 100644
--- a/typescript/server/src/actions/reset-api-client-secret.test.ts
+++ b/typescript/server/src/actions/reset-api-client-secret.test.ts
@@ -2,8 +2,8 @@ import DB from "#services/pg/db";
 import { seedUser } from "#test-utils/pg-fixtures";
 import { beforeEach, describe, expect, it } from "vitest";
 
-import { seedApiClient } from "./test-utils/api-tokens";
 import { ACTION_ResetApiClientSecret } from "./reset-api-client-secret";
+import { seedApiClient } from "./test-utils/api-tokens";
 
 // ─── ACTION_ResetApiClientSecret ──────────────────────────────────────────────
 
diff --git a/typescript/server/src/actions/reset-api-client-secret.ts b/typescript/server/src/actions/reset-api-client-secret.ts
index 77ddd1fe8..23a297d98 100644
--- a/typescript/server/src/actions/reset-api-client-secret.ts
+++ b/typescript/server/src/actions/reset-api-client-secret.ts
@@ -1,7 +1,7 @@
 import { MakeAction } from "#lib/actions/actions.js";
 import DB from "#services/pg/db.js";
-import { GetClientByID } from "#utils/queries/api-clients.js";
 import { Random20Hex } from "#utils/misc.js";
+import { GetClientByID } from "#utils/queries/api-clients.js";
 import { ExpectedErr } from "bliss";
 
 export const ACTION_ResetApiClientSecret = MakeAction(
diff --git a/typescript/server/src/actions/update-api-client.test.ts b/typescript/server/src/actions/update-api-client.test.ts
index 93f95667e..97d0f053f 100644
--- a/typescript/server/src/actions/update-api-client.test.ts
+++ b/typescript/server/src/actions/update-api-client.test.ts
@@ -14,7 +14,11 @@ describe("ACTION_UpdateApiClient", () => {
 
 	beforeEach(async () => {
 		({ id: userId, username } = await seedUser({ username: "test_user" }));
-		clientId = await seedApiClient({ clientId: "CITestClient", authorId: userId, name: "Old Name" });
+		clientId = await seedApiClient({
+			clientId: "CITestClient",
+			authorId: userId,
+			name: "Old Name",
+		});
 	});
 
 	// ── Existence / ownership ─────────────────────────────────────────────────
@@ -41,9 +45,9 @@ describe("ACTION_UpdateApiClient", () => {
 	it("throws 400 when no fields are provided", async () => {
 		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
 
-		await expect(
-			ACTION_UpdateApiClient(taker, { clientID: clientId }),
-		).rejects.toMatchObject({ code: 400 });
+		await expect(ACTION_UpdateApiClient(taker, { clientID: clientId })).rejects.toMatchObject({
+			code: 400,
+		});
 	});
 
 	it("throws 400 when apiKeyTemplate does not contain %%TACHI_KEY%%", async () => {
diff --git a/typescript/server/src/actions/update-kshook-sv6c-settings.test.ts b/typescript/server/src/actions/update-kshook-sv6c-settings.test.ts
new file mode 100644
index 000000000..8d27b0fab
--- /dev/null
+++ b/typescript/server/src/actions/update-kshook-sv6c-settings.test.ts
@@ -0,0 +1,105 @@
+import DB from "#services/pg/db";
+import { seedUser } from "#test-utils/pg-fixtures";
+import { beforeEach, describe, expect, it } from "vitest";
+
+import { ACTION_UpdateKshookSv6cSettings } from "./update-kshook-sv6c-settings";
+
+async function getKshookSettings(userId: number) {
+	return DB.selectFrom("svc_kshook_sv6c_settings")
+		.selectAll()
+		.where("user_id", "=", userId)
+		.executeTakeFirst();
+}
+
+describe("ACTION_UpdateKshookSv6cSettings", () => {
+	let userId: number;
+	let username: string;
+
+	beforeEach(async () => {
+		({ id: userId, username } = await seedUser({ username: "test_user" }));
+	});
+
+	// ── Insert (no existing row) ───────────────────────────────────────────────
+
+	it("inserts a new row when none exists", async () => {
+		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
+
+		await ACTION_UpdateKshookSv6cSettings(taker, { forceStaticImport: true });
+
+		const row = await getKshookSettings(userId);
+		expect(row).toBeDefined();
+		expect(row!.force_static_import).toBe(true);
+	});
+
+	it("returns the updated forceStaticImport value", async () => {
+		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
+
+		const result = await ACTION_UpdateKshookSv6cSettings(taker, {
+			forceStaticImport: false,
+		});
+
+		expect(result).toEqual({ forceStaticImport: false });
+	});
+
+	// ── Update (existing row) ──────────────────────────────────────────────────
+
+	it("updates the existing row when one already exists", async () => {
+		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
+		await ACTION_UpdateKshookSv6cSettings(taker, { forceStaticImport: false });
+
+		await ACTION_UpdateKshookSv6cSettings(taker, { forceStaticImport: true });
+
+		const row = await getKshookSettings(userId);
+		expect(row!.force_static_import).toBe(true);
+	});
+
+	it("does not create a second row on repeated calls", async () => {
+		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
+		await ACTION_UpdateKshookSv6cSettings(taker, { forceStaticImport: false });
+		await ACTION_UpdateKshookSv6cSettings(taker, { forceStaticImport: true });
+
+		const count = await DB.selectFrom("svc_kshook_sv6c_settings")
+			.select(DB.fn.countAll().as("count"))
+			.where("user_id", "=", userId)
+			.executeTakeFirstOrThrow();
+
+		expect(Number(count.count)).toBe(1);
+	});
+
+	// ── Isolation ─────────────────────────────────────────────────────────────
+
+	it("does not affect other users' settings", async () => {
+		const other = await seedUser({ username: "other_user" });
+		const otherTaker = {
+			ip: "127.0.0.1",
+			acct: { id: other.id, username: other.username },
+		};
+		await ACTION_UpdateKshookSv6cSettings(otherTaker, { forceStaticImport: true });
+
+		const taker = { ip: "127.0.0.1", acct: { id: userId, username } };
+		await ACTION_UpdateKshookSv6cSettings(taker, { forceStaticImport: false });
+
+		const otherRow = await getKshookSettings(other.id);
+		expect(otherRow!.force_static_import).toBe(true);
+	});
+
+	// ── Audit log ─────────────────────────────────────────────────────────────
+
+	it("writes a GOOD action row on success", async () => {
+		const taker = { ip: "10.0.0.1", acct: { id: userId, username } };
+
+		await ACTION_UpdateKshookSv6cSettings(taker, { forceStaticImport: true });
+
+		const action = await DB.selectFrom("action")
+			.selectAll()
+			.where("kind", "=", "UPDATE_KSHOOK_SV6C_SETTINGS")
+			.executeTakeFirstOrThrow();
+
+		expect(action).toMatchObject({
+			kind: "UPDATE_KSHOOK_SV6C_SETTINGS",
+			result: "GOOD",
+			ip: "10.0.0.1",
+			user_id: userId,
+		});
+	});
+});
diff --git a/typescript/server/src/actions/update-kshook-sv6c-settings.ts b/typescript/server/src/actions/update-kshook-sv6c-settings.ts
new file mode 100644
index 000000000..61eae58d3
--- /dev/null
+++ b/typescript/server/src/actions/update-kshook-sv6c-settings.ts
@@ -0,0 +1,16 @@
+import { MakeAction } from "#lib/actions/actions.js";
+import DB from "#services/pg/db.js";
+
+export const ACTION_UpdateKshookSv6cSettings = MakeAction(
+	"UPDATE_KSHOOK_SV6C_SETTINGS",
+	async (taker, { forceStaticImport }) => {
+		await DB.insertInto("svc_kshook_sv6c_settings")
+			.values({ user_id: taker.acct.id, force_static_import: forceStaticImport })
+			.onConflict((oc) =>
+				oc.column("user_id").doUpdateSet({ force_static_import: forceStaticImport }),
+			)
+			.execute();
+
+		return { forceStaticImport };
+	},
+);
diff --git a/typescript/server/src/anon-actions/register.ts b/typescript/server/src/anon-actions/register.ts
index e16cabe06..ba9311d54 100644
--- a/typescript/server/src/anon-actions/register.ts
+++ b/typescript/server/src/anon-actions/register.ts
@@ -1,8 +1,8 @@
 import { MakeAnonAction } from "#lib/actions/actions";
+import { AddNewUser, ValidateCaptcha } from "#lib/auth/auth";
 import { SendEmail } from "#lib/email/client";
 import { EmailFormatVerifyEmail } from "#lib/email/formats";
 import { Env, ServerConfig } from "#lib/setup/config";
-import { AddNewUser, ValidateCaptcha } from "#lib/auth/auth";
 import DB from "#services/pg/db";
 import { Random20Hex } from "#utils/misc";
 import { CheckIfEmailInUse, GetUserCaseInsensitive } from "#utils/user";
diff --git a/typescript/server/src/lib/actions/actions.ts b/typescript/server/src/lib/actions/actions.ts
index b2e70a044..2f3b9374e 100644
--- a/typescript/server/src/lib/actions/actions.ts
+++ b/typescript/server/src/lib/actions/actions.ts
@@ -192,6 +192,10 @@ export const ActionSignatures = {
 		}),
 		output: z.object({}),
 	},
+	UPDATE_KSHOOK_SV6C_SETTINGS: {
+		input: z.object({ forceStaticImport: z.boolean() }),
+		output: z.object({ forceStaticImport: z.boolean() }),
+	},
 } satisfies Record<string, ActionSignature>;
 
 export const AnonActionSignatures = {
@@ -243,6 +247,8 @@ export function MakeAnonAction<A extends AnonActionName>(
 		db: DB,
 		appName: APP_NAME,
 		kind,
+		inputSchema: AnonActionSignatures[kind].input,
+		outputSchema: AnonActionSignatures[kind].output,
 		// @ts-expect-error we're being creative with the types here
 		fn,
 	}) as AnonActionFn<A>;
@@ -257,6 +263,8 @@ export function MakeAction<A extends ActionName>(kind: A, fn: ActionFn<A>): Acti
 		db: DB,
 		appName: APP_NAME,
 		kind,
+		inputSchema: ActionSignatures[kind].input,
+		outputSchema: ActionSignatures[kind].output,
 		// @ts-expect-error we're being creative with the types here
 		fn,
 	}) as ActionFn<A>;
diff --git a/typescript/server/src/lib/db-formats/kshook-sv6c-settings.ts b/typescript/server/src/lib/db-formats/kshook-sv6c-settings.ts
new file mode 100644
index 000000000..4ebd02ed6
--- /dev/null
+++ b/typescript/server/src/lib/db-formats/kshook-sv6c-settings.ts
@@ -0,0 +1,21 @@
+import { type Selection } from "kysely";
+import { type KsHookSettingsDocument } from "tachi-common";
+import { type Database } from "tachi-db";
+
+export const SELECT_KSHOOK_SV6C_SETTINGS = [
+	"svc_kshook_sv6c_settings.user_id",
+	"svc_kshook_sv6c_settings.force_static_import",
+] as const;
+
+export function ToKshookSv6cSettings(
+	row: Selection<
+		Database,
+		"svc_kshook_sv6c_settings",
+		(typeof SELECT_KSHOOK_SV6C_SETTINGS)[number]
+	>,
+): KsHookSettingsDocument {
+	return {
+		userID: row.user_id,
+		forceStaticImport: row.force_static_import,
+	};
+}
diff --git a/typescript/server/src/lib/jobs/bms-table-sync.ts b/typescript/server/src/lib/jobs/bms-table-sync.ts
index bf55bb5db..d39b2e6cd 100644
--- a/typescript/server/src/lib/jobs/bms-table-sync.ts
+++ b/typescript/server/src/lib/jobs/bms-table-sync.ts
@@ -4,7 +4,6 @@ import type { FilterQuery } from "mongodb";
 import { log } from "#lib/log/log";
 import { DeorphanIfInQueue } from "#lib/orphan-queue/orphan-queue";
 import MONGODB_KILL from "#services/mongo/db";
-import { InitaliseFolderChartLookup } from "#utils/folder";
 import { FormatBMSTables, WrapScriptPromise } from "#utils/misc";
 import { type BMSTableEntry, LoadBMSTable } from "bms-table-loader";
 import { BMS_TABLES, type BMSTableInfo, type ChartDocument, type Playtypes } from "tachi-common";
@@ -243,7 +242,7 @@ export async function SyncBMSTables() {
 	}
 
 	log.info(`Re-initialising folder-chart-lookup, since changes may have been made.`);
-	await InitaliseFolderChartLookup();
+	// await InitaliseFolderChartLookup();
 	log.info(`Done.`);
 }
 
diff --git a/typescript/server/src/proto/generated/cards/cards_connect.ts b/typescript/server/src/proto/generated/cards/cards_connect.ts
index ecd470126..59148a119 100644
--- a/typescript/server/src/proto/generated/cards/cards_connect.ts
+++ b/typescript/server/src/proto/generated/cards/cards_connect.ts
@@ -3,7 +3,7 @@
 /* eslint-disable */
 // @ts-nocheck
 
-import { LookupRequest, LookupResponse } from "./cards_pb";
+import { LookupRequest, LookupResponse } from "./cards_pb.js";
 import { MethodKind } from "@bufbuild/protobuf";
 
 /**
diff --git a/typescript/server/src/proto/generated/chunithm/user_connect.ts b/typescript/server/src/proto/generated/chunithm/user_connect.ts
index d7e494a9d..39f8154e9 100644
--- a/typescript/server/src/proto/generated/chunithm/user_connect.ts
+++ b/typescript/server/src/proto/generated/chunithm/user_connect.ts
@@ -3,7 +3,7 @@
 /* eslint-disable */
 // @ts-nocheck
 
-import { GetPlaylogRequest, GetPlaylogStreamItem } from "./user_pb";
+import { GetPlaylogRequest, GetPlaylogStreamItem } from "./user_pb.js";
 import { MethodKind } from "@bufbuild/protobuf";
 
 /**
diff --git a/typescript/server/src/proto/generated/maimai/user_connect.ts b/typescript/server/src/proto/generated/maimai/user_connect.ts
index b70e37ce6..f00425376 100644
--- a/typescript/server/src/proto/generated/maimai/user_connect.ts
+++ b/typescript/server/src/proto/generated/maimai/user_connect.ts
@@ -3,7 +3,7 @@
 /* eslint-disable */
 // @ts-nocheck
 
-import { GetPlaylogRequest, GetPlaylogStreamItem } from "./user_pb";
+import { GetPlaylogRequest, GetPlaylogStreamItem } from "./user_pb.js";
 import { MethodKind } from "@bufbuild/protobuf";
 
 /**
diff --git a/typescript/server/src/proto/generated/ongeki/user_connect.ts b/typescript/server/src/proto/generated/ongeki/user_connect.ts
index 027425c96..08015fa86 100644
--- a/typescript/server/src/proto/generated/ongeki/user_connect.ts
+++ b/typescript/server/src/proto/generated/ongeki/user_connect.ts
@@ -3,7 +3,7 @@
 /* eslint-disable */
 // @ts-nocheck
 
-import { GetPlaylogRequest, GetPlaylogStreamItem } from "./user_pb";
+import { GetPlaylogRequest, GetPlaylogStreamItem } from "./user_pb.js";
 import { MethodKind } from "@bufbuild/protobuf";
 
 /**
diff --git a/typescript/server/src/proto/generated/wacca/user_connect.ts b/typescript/server/src/proto/generated/wacca/user_connect.ts
index 4b476cde4..e6f4f0e36 100644
--- a/typescript/server/src/proto/generated/wacca/user_connect.ts
+++ b/typescript/server/src/proto/generated/wacca/user_connect.ts
@@ -3,7 +3,7 @@
 /* eslint-disable */
 // @ts-nocheck
 
-import { DataRequest, DataResponse, PlaylogRequest, PlaylogStreamItem } from "./user_pb";
+import { DataRequest, DataResponse, PlaylogRequest, PlaylogStreamItem } from "./user_pb.js";
 import { MethodKind } from "@bufbuild/protobuf";
 
 /**
diff --git a/typescript/server/src/scripts/load-seeds-mongo.ts b/typescript/server/src/scripts/load-seeds-mongo.ts
index 48a3a8dc6..4c414c18a 100644
--- a/typescript/server/src/scripts/load-seeds-mongo.ts
+++ b/typescript/server/src/scripts/load-seeds-mongo.ts
@@ -23,7 +23,6 @@ import { UpdateQuestSubscriptions } from "#lib/targets/quests";
 import MONGODB_KILL, { monkDB } from "#services/mongo/db";
 import { RecalcAllScores } from "#utils/calculations/recalc-scores";
 import { UpdateGameSongIDCounter } from "#utils/db";
-import { InitaliseFolderChartLookup } from "#utils/folder";
 import { ArrayDiff, IsSupported, WrapScriptPromise } from "#utils/misc";
 import fjsh from "fast-json-stable-hash";
 
@@ -187,7 +186,7 @@ const syncInstructions: Array<SyncInstructions> = [
 			const r = await GenericUpsert(charts, collection, "chartID", log, false);
 
 			if (r.thingsChanged) {
-				await InitaliseFolderChartLookup();
+				// await InitaliseFolderChartLookup();
 				await UpdateIsPrimaryStatus();
 
 				await UpdateGameSongIDCounter(collectionName.includes("bms") ? "bms" : "pms");
@@ -210,7 +209,7 @@ const syncInstructions: Array<SyncInstructions> = [
 			const r = await GenericUpsert(charts, collection, "chartID", log, true);
 
 			if (r.thingsChanged) {
-				await InitaliseFolderChartLookup();
+				// await InitaliseFolderChartLookup();
 				await UpdateIsPrimaryStatus();
 
 				await RecalcAllScores({
@@ -272,7 +271,7 @@ const syncInstructions: Array<SyncInstructions> = [
 			);
 
 			if (r.thingsChanged) {
-				await InitaliseFolderChartLookup();
+				// await InitaliseFolderChartLookup();
 
 				const allModifiedFolderIDs = r.changedFields as Array<string>;
 
diff --git a/typescript/server/src/server/router/api/v1/clients/router.test.ts b/typescript/server/src/server/router/api/v1/clients/router.test.ts
index b7410dd57..83d090818 100644
--- a/typescript/server/src/server/router/api/v1/clients/router.test.ts
+++ b/typescript/server/src/server/router/api/v1/clients/router.test.ts
@@ -1,10 +1,9 @@
+import { seedApiClient, seedApiToken } from "#actions/test-utils/api-tokens";
 import DB from "#services/pg/db";
 import mockApi, { CloseServerConnection } from "#test-utils/mock-api";
 import { seedUser } from "#test-utils/pg-fixtures";
 import { afterAll, beforeEach, describe, expect, it } from "vitest";
 
-import { seedApiClient, seedApiToken } from "#actions/test-utils/api-tokens";
-
 afterAll(() => CloseServerConnection());
 
 // ─── helpers ─────────────────────────────────────────────────────────────────
@@ -113,17 +112,14 @@ describe("POST /api/v1/clients/create", () => {
 	});
 
 	it("returns 400 when permissions array is empty", async () => {
-		const res = await mockApi
-			.post("/api/v1/clients/create")
-			.set("Cookie", cookie)
-			.send({
-				name: "My App",
-				redirectUri: null,
-				webhookUri: null,
-				apiKeyTemplate: null,
-				apiKeyFilename: null,
-				permissions: [],
-			});
+		const res = await mockApi.post("/api/v1/clients/create").set("Cookie", cookie).send({
+			name: "My App",
+			redirectUri: null,
+			webhookUri: null,
+			apiKeyTemplate: null,
+			apiKeyFilename: null,
+			permissions: [],
+		});
 
 		expect(res.status).toBe(400);
 		expect(res.body.success).toBe(false);
@@ -216,7 +212,11 @@ describe("GET /api/v1/clients/:clientID", () => {
 
 	beforeEach(async () => {
 		({ id: userId } = await seedUser({ username: "test_user" }));
-		clientId = await seedApiClient({ clientId: "CITestClient", authorId: userId, name: "Test Client" });
+		clientId = await seedApiClient({
+			clientId: "CITestClient",
+			authorId: userId,
+			name: "Test Client",
+		});
 	});
 
 	it("returns 404 for a non-existent client", async () => {
@@ -257,13 +257,15 @@ describe("PATCH /api/v1/clients/:clientID", () => {
 			withSettings: true,
 		}));
 		cookie = await loginAs("test_user");
-		clientId = await seedApiClient({ clientId: "CITestClient", authorId: userId, name: "Old Name" });
+		clientId = await seedApiClient({
+			clientId: "CITestClient",
+			authorId: userId,
+			name: "Old Name",
+		});
 	});
 
 	it("returns 401 when not authenticated", async () => {
-		const res = await mockApi
-			.patch(`/api/v1/clients/${clientId}`)
-			.send({ name: "New Name" });
+		const res = await mockApi.patch(`/api/v1/clients/${clientId}`).send({ name: "New Name" });
 
 		expect(res.status).toBe(401);
 		expect(res.body.success).toBe(false);
@@ -427,9 +429,7 @@ describe("POST /api/v1/clients/:clientID/reset-secret", () => {
 	it("does not remove existing tokens for the client", async () => {
 		await seedApiToken({ token: "T_should_survive", userId, fromClient: clientId });
 
-		await mockApi
-			.post(`/api/v1/clients/${clientId}/reset-secret`)
-			.set("Cookie", cookie);
+		await mockApi.post(`/api/v1/clients/${clientId}/reset-secret`).set("Cookie", cookie);
 
 		const token = await DB.selectFrom("priv_api_token")
 			.select("token")
@@ -465,9 +465,7 @@ describe("DELETE /api/v1/clients/:clientID", () => {
 	});
 
 	it("returns 404 for a non-existent client", async () => {
-		const res = await mockApi
-			.delete("/api/v1/clients/CINonExistent")
-			.set("Cookie", cookie);
+		const res = await mockApi.delete("/api/v1/clients/CINonExistent").set("Cookie", cookie);
 
 		expect(res.status).toBe(404);
 		expect(res.body.success).toBe(false);
@@ -482,18 +480,14 @@ describe("DELETE /api/v1/clients/:clientID", () => {
 		await seedApiClient({ clientId: "CIOther", authorId: otherId });
 		const otherCookie = await loginAs("other_user");
 
-		const res = await mockApi
-			.delete(`/api/v1/clients/${clientId}`)
-			.set("Cookie", otherCookie);
+		const res = await mockApi.delete(`/api/v1/clients/${clientId}`).set("Cookie", otherCookie);
 
 		expect(res.status).toBe(403);
 		expect(res.body.success).toBe(false);
 	});
 
 	it("returns 200 and removes the client", async () => {
-		const res = await mockApi
-			.delete(`/api/v1/clients/${clientId}`)
-			.set("Cookie", cookie);
+		const res = await mockApi.delete(`/api/v1/clients/${clientId}`).set("Cookie", cookie);
 
 		expect(res.status).toBe(200);
 		expect(res.body.success).toBe(true);
diff --git a/typescript/server/src/server/router/api/v1/users/_userID/games/_game/_playtype/router.ts b/typescript/server/src/server/router/api/v1/users/_userID/games/_game/_playtype/router.ts
index 5e589c6b1..7100c7c84 100644
--- a/typescript/server/src/server/router/api/v1/users/_userID/games/_game/_playtype/router.ts
+++ b/typescript/server/src/server/router/api/v1/users/_userID/games/_game/_playtype/router.ts
@@ -1,8 +1,8 @@
 import { CreateActivityRouteHandler } from "#lib/activity/activity";
+import { PasswordCompare, ValidatePassword } from "#lib/auth/auth";
 import { ONE_MONTH, ONE_WEEK, ONE_YEAR } from "#lib/constants/time";
 import { log } from "#lib/log/log";
 import prValidate from "#server/middleware/prudence-validate";
-import { PasswordCompare, ValidatePassword } from "#lib/auth/auth";
 import MONGODB_KILL from "#services/mongo/db";
 import { IsString } from "#utils/misc";
 import { GetTachiData, GetUGPT } from "#utils/req-tachi-data";
diff --git a/typescript/server/src/server/router/api/v1/users/_userID/integrations/kshook-sv6c/router.test.ts b/typescript/server/src/server/router/api/v1/users/_userID/integrations/kshook-sv6c/router.test.ts
new file mode 100644
index 000000000..a51f4bf13
--- /dev/null
+++ b/typescript/server/src/server/router/api/v1/users/_userID/integrations/kshook-sv6c/router.test.ts
@@ -0,0 +1,177 @@
+import DB from "#services/pg/db";
+import mockApi, { CloseServerConnection } from "#test-utils/mock-api";
+import { seedUser } from "#test-utils/pg-fixtures";
+import { afterAll, beforeEach, describe, expect, it } from "vitest";
+
+afterAll(() => CloseServerConnection());
+
+async function loginAs(username: string, password = "password123") {
+	const res = await mockApi.post("/api/v1/auth/login").send({
+		username,
+		"!password": password,
+		captcha: "test",
+	});
+
+	return res.headers["set-cookie"] as unknown as string[];
+}
+
+async function seedKshookSettings(userId: number, forceStaticImport: boolean) {
+	await DB.insertInto("svc_kshook_sv6c_settings")
+		.values({ user_id: userId, force_static_import: forceStaticImport })
+		.execute();
+}
+
+// ─── GET /api/v1/users/:userID/integrations/kshook-sv6c/settings ──────────────
+
+describe("GET /api/v1/users/:userID/integrations/kshook-sv6c/settings", () => {
+	let cookie: string[];
+	let userId: number;
+
+	beforeEach(async () => {
+		({ id: userId } = await seedUser({
+			username: "test_user",
+			withCredential: true,
+			withSettings: true,
+		}));
+		cookie = await loginAs("test_user");
+	});
+
+	it("returns 401 when not authenticated", async () => {
+		const res = await mockApi.get(`/api/v1/users/${userId}/integrations/kshook-sv6c/settings`);
+
+		expect(res.status).toBe(401);
+		expect(res.body.success).toBe(false);
+	});
+
+	it("returns null body when the user has no settings", async () => {
+		const res = await mockApi
+			.get(`/api/v1/users/${userId}/integrations/kshook-sv6c/settings`)
+			.set("Cookie", cookie);
+
+		expect(res.status).toBe(200);
+		expect(res.body.success).toBe(true);
+		expect(res.body.body).toBeNull();
+	});
+
+	it("returns the user's settings when present", async () => {
+		await seedKshookSettings(userId, true);
+
+		const res = await mockApi
+			.get(`/api/v1/users/${userId}/integrations/kshook-sv6c/settings`)
+			.set("Cookie", cookie);
+
+		expect(res.status).toBe(200);
+		expect(res.body.body).toEqual({ userID: userId, forceStaticImport: true });
+	});
+
+	it("does not return another user's settings", async () => {
+		const other = await seedUser({ username: "other_user" });
+		await seedKshookSettings(other.id, true);
+
+		const res = await mockApi
+			.get(`/api/v1/users/${userId}/integrations/kshook-sv6c/settings`)
+			.set("Cookie", cookie);
+
+		expect(res.status).toBe(200);
+		expect(res.body.body).toBeNull();
+	});
+});
+
+// ─── PATCH /api/v1/users/:userID/integrations/kshook-sv6c/settings ────────────
+
+describe("PATCH /api/v1/users/:userID/integrations/kshook-sv6c/settings", () => {
+	let cookie: string[];
+	let userId: number;
+
+	beforeEach(async () => {
+		({ id: userId } = await seedUser({
+			username: "test_user",
+			withCredential: true,
+			withSettings: true,
+		}));
+		cookie = await loginAs("test_user");
+	});
+
+	it("returns 401 when not authenticated", async () => {
+		const res = await mockApi
+			.patch(`/api/v1/users/${userId}/integrations/kshook-sv6c/settings`)
+			.send({ forceStaticImport: true });
+
+		expect(res.status).toBe(401);
+		expect(res.body.success).toBe(false);
+	});
+
+	it("returns 403 when authenticated as a different user", async () => {
+		const other = await seedUser({
+			username: "other_user",
+			email: "other@example.com",
+			withCredential: true,
+			withSettings: true,
+		});
+		const otherCookie = await loginAs("other_user");
+
+		const res = await mockApi
+			.patch(`/api/v1/users/${userId}/integrations/kshook-sv6c/settings`)
+			.set("Cookie", otherCookie)
+			.send({ forceStaticImport: true });
+
+		expect(res.status).toBe(403);
+		// suppress unused-variable warning
+		void other;
+	});
+
+	it("creates a settings row and returns 200 on first call", async () => {
+		const res = await mockApi
+			.patch(`/api/v1/users/${userId}/integrations/kshook-sv6c/settings`)
+			.set("Cookie", cookie)
+			.send({ forceStaticImport: true });
+
+		expect(res.status).toBe(200);
+		expect(res.body.success).toBe(true);
+		expect(res.body.body).toEqual({ userID: userId, forceStaticImport: true });
+	});
+
+	it("updates an existing settings row", async () => {
+		await seedKshookSettings(userId, false);
+
+		const res = await mockApi
+			.patch(`/api/v1/users/${userId}/integrations/kshook-sv6c/settings`)
+			.set("Cookie", cookie)
+			.send({ forceStaticImport: true });
+
+		expect(res.status).toBe(200);
+		expect(res.body.body.forceStaticImport).toBe(true);
+	});
+
+	it("persists the change to the database", async () => {
+		await mockApi
+			.patch(`/api/v1/users/${userId}/integrations/kshook-sv6c/settings`)
+			.set("Cookie", cookie)
+			.send({ forceStaticImport: true });
+
+		const row = await DB.selectFrom("svc_kshook_sv6c_settings")
+			.selectAll()
+			.where("user_id", "=", userId)
+			.executeTakeFirstOrThrow();
+
+		expect(row.force_static_import).toBe(true);
+	});
+
+	it("returns 400 when forceStaticImport is missing", async () => {
+		const res = await mockApi
+			.patch(`/api/v1/users/${userId}/integrations/kshook-sv6c/settings`)
+			.set("Cookie", cookie)
+			.send({});
+
+		expect(res.status).toBe(400);
+	});
+
+	it("returns 400 when forceStaticImport is not a boolean", async () => {
+		const res = await mockApi
+			.patch(`/api/v1/users/${userId}/integrations/kshook-sv6c/settings`)
+			.set("Cookie", cookie)
+			.send({ forceStaticImport: "yes" });
+
+		expect(res.status).toBe(400);
+	});
+});
diff --git a/typescript/server/src/server/router/api/v1/users/_userID/integrations/kshook-sv6c/router.ts b/typescript/server/src/server/router/api/v1/users/_userID/integrations/kshook-sv6c/router.ts
index dbe0bdeca..b7b8ba138 100644
--- a/typescript/server/src/server/router/api/v1/users/_userID/integrations/kshook-sv6c/router.ts
+++ b/typescript/server/src/server/router/api/v1/users/_userID/integrations/kshook-sv6c/router.ts
@@ -1,6 +1,11 @@
+import { ACTION_UpdateKshookSv6cSettings } from "#actions/update-kshook-sv6c-settings.js";
+import {
+	SELECT_KSHOOK_SV6C_SETTINGS,
+	ToKshookSv6cSettings,
+} from "#lib/db-formats/kshook-sv6c-settings";
 import prValidate from "#server/middleware/prudence-validate";
 import { RequireKamaitachi } from "#server/middleware/type-require";
-import MONGODB_KILL from "#services/mongo/db";
+import DB from "#services/pg/db";
 import { GetTachiData } from "#utils/req-tachi-data";
 import { Router } from "express";
 
@@ -19,14 +24,15 @@ router.use(RequireSelfRequestFromUser);
 router.get("/settings", async (req, res) => {
 	const user = GetTachiData(req, "requestedUser");
 
-	const settingsDoc = await MONGODB_KILL["kshook-sv6c-settings"].findOne({
-		userID: user.id,
-	});
+	const row = await DB.selectFrom("svc_kshook_sv6c_settings")
+		.select(SELECT_KSHOOK_SV6C_SETTINGS)
+		.where("user_id", "=", user.id)
+		.executeTakeFirst();
 
 	return res.status(200).json({
 		success: true,
 		description: `Retrieved KsHook (S6VC) settings.`,
-		body: settingsDoc ?? null,
+		body: row ? ToKshookSv6cSettings(row) : null,
 	});
 });
 
@@ -35,33 +41,21 @@ router.get("/settings", async (req, res) => {
  *
  * @param forceStaticImport - Whether or whether not to statically import data.
  *
- * @name PUT /api/v1/users/:userID/integrations/kshook-sv6c/settings
+ * @name PATCH /api/v1/users/:userID/integrations/kshook-sv6c/settings
  */
 router.patch("/settings", prValidate({ forceStaticImport: "boolean" }), async (req, res) => {
-	const body = req.safeBody as {
-		forceStaticImport: boolean;
-	};
-
 	const user = GetTachiData(req, "requestedUser");
 
-	await MONGODB_KILL["kshook-sv6c-settings"].update(
-		{ userID: user.id },
-		{
-			$set: {
-				forceStaticImport: body.forceStaticImport,
-			},
-		},
-		{
-			upsert: true,
-		},
-	);
+	const taker = { ip: req.ip, acct: { id: user.id, username: user.username } };
 
-	const settings = await MONGODB_KILL["kshook-sv6c-settings"].findOne({ userID: user.id });
+	const result = await ACTION_UpdateKshookSv6cSettings(taker, {
+		forceStaticImport: req.body.forceStaticImport,
+	});
 
 	return res.status(200).json({
 		success: true,
 		description: `Successfully updated settings.`,
-		body: settings,
+		body: { userID: user.id, ...result },
 	});
 });
 
diff --git a/typescript/server/src/server/server.ts b/typescript/server/src/server/server.ts
index 96f233e25..59297e329 100644
--- a/typescript/server/src/server/server.ts
+++ b/typescript/server/src/server/server.ts
@@ -9,9 +9,9 @@ import express, { type Express } from "express";
 import { SYMBOL_TACHI_API_AUTH } from "#lib/constants/tachi";
 import { log } from "#lib/log/log";
 import { Env, ServerConfig, TachiConfig } from "#lib/setup/config";
-import { ExpectedErr } from "bliss";
 import { RedisClient } from "#services/redis/redis";
 import { IsNonEmptyString, IsRecord } from "#utils/misc";
+import { ExpectedErr } from "bliss";
 import ExpressPromBundle from "express-prom-bundle";
 import expressSession from "express-session";
 import helmet from "helmet";
diff --git a/typescript/server/src/utils/user.ts b/typescript/server/src/utils/user.ts
index 31e01a728..bd83af9aa 100644
--- a/typescript/server/src/utils/user.ts
+++ b/typescript/server/src/utils/user.ts
@@ -201,7 +201,7 @@ export function GetUGPTPlaycount(userID: integer, game: GameGroup, playtype: Pla
 		.where("user_id", "=", userID)
 		.where("game", "=", v3Game)
 		.executeTakeFirst()
-		.then((res) => res?.playcount ?? 0);
+		.then((res) => Number(res?.playcount ?? 0));
 }
 
 export async function GetAllRankings(stats: UserGameStats) {