diff --git a/CHANGELOG.md b/CHANGELOG.md
index 795c353c89..e298d4f7f6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -80,6 +80,7 @@ _Living section — bullets land here as PRs merge into `release/v3.8.47` (paral
 - **chore(open-sse):** removed the vestigial `// @ts-nocheck` directive from `open-sse/utils/usageTracking.ts` ([#6173](https://github.com/diegosouzapw/OmniRoute/pull/6173)) — `tsc` under the standard `typecheck:core` gate reports 0 errors for this 595-line hot-path file (executed for every provider response), so the suppression was no longer needed; removing it restores type-checking on the token-usage extraction/normalization path. (thanks @KooshaPari)
 - **chore(cli):** the shell-completion cache paths (`readCache`/`refreshCache`/`writeCache`) in `bin/cli/commands/completion.mjs` no longer swallow errors into a bare `catch {}` ([#6257](https://github.com/diegosouzapw/OmniRoute/pull/6257)) — each now binds the error and, when the new `OMNIROUTE_DEBUG_COMPLETION` env var is set, emits a `[omniroute completion]` diagnostic to `stderr`; the caches still fail silently by default so a missing/corrupt cache never breaks tab-completion. (thanks @KooshaPari)
 - **chore(quality):** `validate-release-green --full-ci` reproduces the full `ci.yml` static gate set locally — the pre-flight now reads `ci.yml` itself and runs every `npm run check:*` from the `lint` / `quality-gate` / `quality-extended` / `docs-sync-strict` / `pr-test-policy` jobs (`--` ratchet flags preserved, `test-masking` against `GITHUB_BASE_REF=main`), skipping only the non-local `pr-evidence`/`codeql-ratchet`. Closes the gap where 11 static base-reds leaked to the v3.8.46 release PR in ~2h of layered CI. Also wired into `nightly-release-green` so a static base-red opens a tracking issue the night it lands. Regression guard: `tests/unit/validate-release-green.test.ts` (+5 `extractCiGates` cases).
+- **refactor(usage):** `saveRequestUsage(entry: any)` is now typed with a new `UsageEntry` interface mirroring the `usage_history` columns 1:1 (#3512) — the other stray `any`s in `src/lib/usage/usageHistory.ts` (`getUsageHistory` filter, the `getUsageDb` next-cursor cast, `appendRequestLog`'s legacy `tokens` param, `getRecentLogs`'s catch) were cleaned in the same pass, so the file now sits in the `check:any-budget:t11` zero-`any` allowlist. The DB-entity ↔ TS-interface convention is documented in `docs/architecture/CODEBASE_DOCUMENTATION.md` §11.
 
 ### 🙌 Contributors
 
diff --git a/docs/architecture/CODEBASE_DOCUMENTATION.md b/docs/architecture/CODEBASE_DOCUMENTATION.md
index 3c6f09022b..ccf2ea0d36 100644
--- a/docs/architecture/CODEBASE_DOCUMENTATION.md
+++ b/docs/architecture/CODEBASE_DOCUMENTATION.md
@@ -793,6 +793,20 @@ See [A2A-SERVER.md § Adding a New Skill](../frameworks/A2A-SERVER.md). Skills l
   inference for cross-module boundaries.
 - **Database**: never write raw SQL in routes or handlers — always go through
   `src/lib/db/` modules. Never add logic to `src/lib/localDb.ts`.
+- **DB-entity typing (#3512)**: a function that writes or reads a DB table's
+  row shape should take/return a named TS interface mirroring that table's
+  columns 1:1, not `any` or an inline anonymous type at the call site. Land
+  the interface next to the function (e.g. `export interface UsageEntry` in
+  `src/lib/usage/usageHistory.ts` above `saveRequestUsage`), keep individual
+  fields optional/nullable when different writers populate the row
+  incrementally, and prefer `unknown` over `any` for a field whose shape
+  varies across callers (documented on the field, e.g. `UsageEntry.tokens`
+  accepts both raw provider-shaped usage and the normalized shape). Once a
+  file's `any` count reaches zero this way, add it to the
+  `check:any-budget:t11` allowlist (`scripts/check/check-t11-any-budget.mjs`,
+  `maxAny: 0`) so it can't regress. This is a first-slice convention — the
+  broader "no anonymous `any`" cleanup is iterative across the rest of the
+  codebase.
 - **Errors**: try/catch with specific error types, log with pino context. Never
   silently swallow errors in SSE streams; use abort signals for cleanup.
 - **Security**: never use `eval()` / `new Function()` / implied eval. Validate
diff --git a/scripts/check/check-t11-any-budget.mjs b/scripts/check/check-t11-any-budget.mjs
index d1ae1706c2..3330aa2158 100644
--- a/scripts/check/check-t11-any-budget.mjs
+++ b/scripts/check/check-t11-any-budget.mjs
@@ -22,6 +22,10 @@ const budget = [
   { file: "src/lib/db/prompts.ts", maxAny: 0 },
   { file: "src/lib/db/providers.ts", maxAny: 0 },
   { file: "src/lib/db/settings.ts", maxAny: 0 },
+  // #3512: saveRequestUsage typed with UsageEntry (DB-entity 1:1 interface); the
+  // other any's in this file (getUsageHistory filter, nextCursor cast,
+  // appendRequestLog tokens, getRecentLogs catch) were cleaned in the same pass.
+  { file: "src/lib/usage/usageHistory.ts", maxAny: 0 },
   { file: "open-sse/config/providerRegistry.ts", maxAny: 0 },
   { file: "open-sse/config/providerModels.ts", maxAny: 0 },
   { file: "open-sse/mcp-server/audit.ts", maxAny: 0 },
diff --git a/src/lib/usage/usageHistory.ts b/src/lib/usage/usageHistory.ts
index 74fec28f16..a13ffb13f6 100644
--- a/src/lib/usage/usageHistory.ts
+++ b/src/lib/usage/usageHistory.ts
@@ -553,17 +553,58 @@ export async function getUsageDb(sinceIso?: string | null, limit?: number, curso
   });
 
   // Provide next cursor if we hit the limit (more rows exist)
-  const nextCursor = rows.length === maxRows ? (rows[rows.length - 1] as any)?.timestamp : null;
+  const nextCursor =
+    rows.length === maxRows ? toStringOrNull(asRecord(rows[rows.length - 1]).timestamp) : null;
 
   return { data: { history, nextCursor } };
 }
 
 // ──────────────── Save Request Usage ────────────────
 
+/**
+ * DB-entity-mapped shape accepted by {@link saveRequestUsage}, mirroring the
+ * `usage_history` table columns 1:1 (see `src/lib/db/migrations/`). Convention
+ * (#3512): every `usage_history` writer should type its entry against this
+ * interface instead of an inline anonymous object or `any` — call sites are
+ * intentionally permissive (fields optional/nullable) because rows are built
+ * incrementally across several extraction points (chatCore success/failure
+ * paths, rejected-request accounting, the Codex Responses WS bridge).
+ *
+ * `tokens` stays `unknown` on purpose: callers pass either the raw
+ * provider-shaped usage object (OpenAI `prompt_tokens`/`completion_tokens`,
+ * Anthropic `input_tokens`/`cache_read_input_tokens`, …) or the already
+ * normalized `{ input, output, cacheRead, cacheCreation, reasoning }` shape —
+ * `getLoggedInputTokens`/`getLoggedOutputTokens`/`getPromptCache*Tokens` in
+ * `./tokenAccounting` accept both and extract the right fields.
+ */
+export interface UsageEntry {
+  provider?: string | null;
+  model?: string | null;
+  /** Raw or normalized token usage — see the interface doc above. */
+  tokens?: unknown;
+  status?: string | null;
+  success?: boolean;
+  latencyMs?: number;
+  timeToFirstTokenMs?: number;
+  errorCode?: string | null;
+  /** ISO timestamp; defaults to `new Date().toISOString()` when omitted. */
+  timestamp?: string;
+  connectionId?: string | null;
+  apiKeyId?: string | null;
+  apiKeyName?: string | null;
+  serviceTier?: string | null;
+  /** @deprecated legacy snake_case fallback, read only if `serviceTier` is unset. */
+  service_tier?: string | null;
+  comboStrategy?: string | null;
+  /** @deprecated legacy snake_case fallback, read only if `comboStrategy` is unset. */
+  combo_strategy?: string | null;
+  endpoint?: string | null;
+}
+
 /**
  * Save request usage entry to SQLite.
  */
-export async function saveRequestUsage(entry: any) {
+export async function saveRequestUsage(entry: UsageEntry) {
   if (!shouldPersistToDisk) return;
 
   try {
@@ -666,10 +707,17 @@ export async function saveRequestUsage(entry: any) {
 
 // ──────────────── Get Usage History ────────────────
 
+export interface UsageHistoryFilter {
+  provider?: string;
+  model?: string;
+  startDate?: string | number | Date;
+  endDate?: string | number | Date;
+}
+
 /**
  * Get usage history with optional filters.
  */
-export async function getUsageHistory(filter: any = {}) {
+export async function getUsageHistory(filter: UsageHistoryFilter = {}) {
   const db = getDbInstance();
   let sql = "SELECT * FROM usage_history";
   const conditions: string[] = [];
@@ -875,7 +923,7 @@ export async function appendRequestLog({
   model?: string;
   provider?: string;
   connectionId?: string;
-  tokens?: any;
+  tokens?: unknown;
   status?: string | number;
 }) {
   // Deprecated: request summaries now come from SQLite call_logs.
@@ -909,8 +957,11 @@ export async function getRecentLogs(limit = 200) {
       const status = typeof row.status === "number" ? row.status : String(row.status || "-");
       return `${timestamp} | ${model} | ${provider} | ${account} | ${tokensIn} | ${tokensOut} | ${status}`;
     });
-  } catch (error: any) {
-    console.error("[usageDb] Failed to read recent call logs:", error.message);
+  } catch (error) {
+    console.error(
+      "[usageDb] Failed to read recent call logs:",
+      error instanceof Error ? error.message : String(error)
+    );
     return [];
   }
 }