From 7102875bf5d9e183e4f0c09c8f3673484a5fc22a Mon Sep 17 00:00:00 2001
From: DualFroz <me@dualfroz.com>
Date: Tue, 25 Aug 2026 09:00:00 +0200
Subject: [PATCH] feat(batch): add batched write buffer

---
 src/batch.zig | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 src/batch.zig

diff --git a/src/batch.zig b/src/batch.zig
new file mode 100644
index 0000000..76aa581
--- /dev/null
+++ b/src/batch.zig
@@ -0,0 +1,46 @@
+const std = @import("std");
+const encode = @import("encode.zig");
+
+const Allocator = std.mem.Allocator;
+const Kind = encode.Kind;
+
+pub const Op = struct {
+    kind: Kind,
+    key: []u8,
+    value: []u8,
+};
+
+pub const WriteBatch = struct {
+    allocator: Allocator,
+    ops: std.ArrayList(Op),
+
+    pub fn init(allocator: Allocator) WriteBatch {
+        return .{ .allocator = allocator, .ops = std.ArrayList(Op).init(allocator) };
+    }
+
+    pub fn deinit(self: *WriteBatch) void {
+        for (self.ops.items) |op| {
+            self.allocator.free(op.key);
+            self.allocator.free(op.value);
+        }
+        self.ops.deinit();
+    }
+
+    pub fn put(self: *WriteBatch, key: []const u8, value: []const u8) !void {
+        const keyCopy = try self.allocator.dupe(u8, key);
+        errdefer self.allocator.free(keyCopy);
+        const valueCopy = try self.allocator.dupe(u8, value);
+        try self.ops.append(.{ .kind = .value, .key = keyCopy, .value = valueCopy });
+    }
+
+    pub fn delete(self: *WriteBatch, key: []const u8) !void {
+        const keyCopy = try self.allocator.dupe(u8, key);
+        errdefer self.allocator.free(keyCopy);
+        const valueCopy = try self.allocator.dupe(u8, &.{});
+        try self.ops.append(.{ .kind = .tombstone, .key = keyCopy, .value = valueCopy });
+    }
+
+    pub fn count(self: *const WriteBatch) usize {
+        return self.ops.items.len;
+    }
+};