finish service.zig cleanup

src/format.zig

@@ -281,7 +281,7 @@ pub fn fmtLargeNum(val: f64) [15]u8 {
 /// Get today's date.
 pub fn todayDate() Date {
     const ts = std.time.timestamp();
-    const days: i32 = @intCast(@divFloor(ts, 86400));
+    const days: i32 = @intCast(@divFloor(ts, std.time.s_per_day));
     return .{ .days = days };
 }
 

src/net/RateLimiter.zig

@@ -59,6 +59,13 @@ pub fn acquire(self: *RateLimiter) void {
     }
 }
 
+/// Sleep until a token is likely available, with a minimum 2-second floor.
+/// Use after receiving a server-side 429 to wait before retrying.
+pub fn backoff(self: *RateLimiter) void {
+    const wait_ns: u64 = @max(self.estimateWaitNs(), 2 * std.time.ns_per_s);
+    std.Thread.sleep(wait_ns);
+}
+
 /// Returns estimated wait time in nanoseconds until a token is available.
 /// Returns 0 if a token is available now.
 pub fn estimateWaitNs(self: *RateLimiter) u64 {

src/service.zig

@@ -26,6 +26,7 @@ const Cboe = @import("providers/cboe.zig").Cboe;
 const AlphaVantage = @import("providers/alphavantage.zig").AlphaVantage;
 const alphavantage = @import("providers/alphavantage.zig");
 const OpenFigi = @import("providers/openfigi.zig");
+const fmt = @import("format.zig");
 const performance = @import("analytics/performance.zig");
 
 pub const DataError = error{
@@ -219,7 +220,7 @@ pub const DataService = struct {
     /// the entire history.
     pub fn getCandles(self: *DataService, symbol: []const u8) DataError!FetchResult(Candle) {
         var s = self.store();
-        const today = todayDate();
+        const today = fmt.todayDate();
 
         // Check candle metadata for freshness (tiny file, no candle deserialization)
         const meta_result = s.readCandleMeta(symbol);
@@ -325,7 +326,7 @@ pub const DataService = struct {
     /// date has no actual results yet (i.e. results just came out).
     pub fn getEarnings(self: *DataService, symbol: []const u8) DataError!FetchResult(EarningsEvent) {
         var s = self.store();
-        const today = todayDate();
+        const today = fmt.todayDate();
 
         if (s.read(EarningsEvent, symbol, earningsPostProcess, .fresh_only)) |cached| {
             // Check if any past/today earnings event is still missing actual results.
@@ -420,7 +421,7 @@ pub const DataService = struct {
         const c = candle_result.data;
         if (c.len == 0) return DataError.FetchFailed;
 
-        const today = todayDate();
+        const today = fmt.todayDate();
 
         // As-of-date (end = last candle)
         const asof_price = performance.trailingReturns(c);
@@ -706,18 +707,12 @@ pub const DataService = struct {
     // ── Utility ──────────────────────────────────────────────────
 
     /// Sleep before retrying after a rate limit error.
-    /// Uses the provider's rate limiter estimate if available, otherwise a fixed 10s backoff.
+    /// Uses the provider's rate limiter if available, otherwise a fixed 10s backoff.
     fn rateLimitBackoff(self: *DataService) void {
-        const wait_ns: u64 = if (self.td) |*td|
-            @max(td.rate_limiter.estimateWaitNs(), 2 * std.time.ns_per_s)
-        else
-            10 * std.time.ns_per_s;
-        std.Thread.sleep(wait_ns);
+        if (self.td) |*td| {
+            td.rate_limiter.backoff();
+        } else {
+            std.Thread.sleep(10 * std.time.ns_per_s);
         }
-
-    fn todayDate() Date {
-        const ts = std.time.timestamp();
-        const days: i32 = @intCast(@divFloor(ts, std.time.s_per_day));
-        return .{ .days = days };
     }
 };