diff --git a/CHANGELOG.md b/CHANGELOG.md
index 189b5fc8..ae707cfa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,14 +1,33 @@
 # Changelog
 ## [Unreleased]
 
+## [0.52.0] - 2026-06-01
+
 ### Added
 
 - `haiku-ingester run-batch`: one discover sweep across every configured source, drains the queue, then exits. Orphan deletion requires a persisted `ingester.db`.
+- `max_file_size` (bytes) on every source type rejects oversized files before they are read into memory; they dead-letter as a permanent `FileTooLargeError`. FS and S3 check the size from metadata before fetching; HTTP and WebDAV rely on a `Content-Length` response header, so a server that omits it is not enforced.
+
+### Changed
+
+- Idle workers wake on enqueue via an `asyncio.Condition` instead of polling on `poll_idle_interval_s`.
+- `sync_state` writes are batched into one transaction per sweep (`SyncStateRepo.batch_upsert`) instead of one commit per file.
+- HTTP and WebDAV sources reuse a single `httpx.AsyncClient` across `head`/`fetch`/`discover` instead of opening one per request.
+- Periodic poll sweeps start after a random jitter of 0–25% of `poll_interval_s`.
+- New partial index `idx_jobs_succeeded_completed` backs the dashboard rolling-throughput query.
 
 ### Removed
 
 - `haiku-ingester run-once`. Use `run-batch` to ingest configured sources, or `serve` for continuous operation.
 
+### Fixed
+
+- Revision-less HTTP/S3/WebDAV resources (no ETag or Last-Modified) emit `UNCHANGED` once known instead of re-ingesting on every sweep.
+- Deleted, unreadable, and directory paths (`FileNotFoundError`, `PermissionError`, `IsADirectoryError`, `NotADirectoryError`) classify as permanent failures instead of exhausting retries first.
+- FS `discover()` and the watch loop no longer crash when a file is removed between listing and `stat()`.
+- HTTP `discover()` catches only `httpx.TransportError`; other exceptions propagate instead of being emitted as UPSERT.
+- A `sync_state` write that fails after a job is marked succeeded is logged instead of crashing the worker.
+
 ## [0.51.0] - 2026-05-29
 
 ### Added
@@ -1637,7 +1656,8 @@ Existing documents without DoclingDocument data will work but won't have provena
 
 - Initial version tracking
 
-[Unreleased]: https://github.com/ggozad/haiku.rag/compare/0.51.0...HEAD
+[Unreleased]: https://github.com/ggozad/haiku.rag/compare/0.52.0...HEAD
+[0.52.0]: https://github.com/ggozad/haiku.rag/compare/0.51.0...0.52.0
 [0.51.0]: https://github.com/ggozad/haiku.rag/compare/0.50.0...0.51.0
 [0.50.0]: https://github.com/ggozad/haiku.rag/compare/0.48.1...0.50.0
 [0.48.1]: https://github.com/ggozad/haiku.rag/compare/0.48.0...0.48.1
diff --git a/app/backend/pyproject.toml b/app/backend/pyproject.toml
index 6b591c22..a5aecaff 100644
--- a/app/backend/pyproject.toml
+++ b/app/backend/pyproject.toml
@@ -8,7 +8,7 @@ dependencies = [
     "uvicorn[standard]>=0.40.0",
     "pydantic-ai-slim[ag-ui,anthropic,openai]>=1.81.0",
     "python-dotenv>=1.2.1",
-    "haiku.rag-slim>=0.51.0",
+    "haiku.rag-slim>=0.52.0",
     "logfire[pydantic-ai]>=3.17.0",
 ]
 
diff --git a/evaluations/pyproject.toml b/evaluations/pyproject.toml
index e7360ad8..c9a706d4 100644
--- a/evaluations/pyproject.toml
+++ b/evaluations/pyproject.toml
@@ -2,7 +2,7 @@
 
 name = "haiku.rag-evals"
 description = "Benchmarking and evaluation scripts for haiku.rag"
-version = "0.51.0"
+version = "0.52.0"
 authors = [{ name = "Yiorgis Gozadinos", email = "ggozadinos@gmail.com" }]
 license = { text = "MIT" }
 requires-python = ">=3.12"
diff --git a/haiku_rag_slim/pyproject.toml b/haiku_rag_slim/pyproject.toml
index b4bca2b5..3e4b9208 100644
--- a/haiku_rag_slim/pyproject.toml
+++ b/haiku_rag_slim/pyproject.toml
@@ -2,7 +2,7 @@
 
 name = "haiku.rag-slim"
 description = "Opinionated agentic RAG powered by LanceDB, Pydantic AI, and Docling - Minimal dependencies"
-version = "0.51.0"
+version = "0.52.0"
 authors = [{ name = "Yiorgis Gozadinos", email = "ggozadinos@gmail.com" }]
 license = { text = "MIT" }
 readme = { file = "README.md", content-type = "text/markdown" }
diff --git a/pyproject.toml b/pyproject.toml
index 94245c67..57ce1454 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,7 @@
 
 name = "haiku.rag"
 description = "Opinionated agentic RAG powered by LanceDB, Pydantic AI, and Docling"
-version = "0.51.0"
+version = "0.52.0"
 authors = [{ name = "Yiorgis Gozadinos", email = "ggozadinos@gmail.com" }]
 license = { text = "MIT" }
 readme = { file = "README.md", content-type = "text/markdown" }
@@ -30,7 +30,7 @@ classifiers = [
 ]
 
 dependencies = [
-    "haiku.rag-slim[docling,voyageai,mxbai,cohere,zeroentropy,tui,cross-encoder]==0.51.0",
+    "haiku.rag-slim[docling,voyageai,mxbai,cohere,zeroentropy,tui,cross-encoder]==0.52.0",
 ]
 
 [project.scripts]
@@ -38,9 +38,9 @@ haiku-rag = "haiku.rag.cli:cli"
 
 [project.optional-dependencies]
 tui = ["textual>=8.2.4"]
-s3 = ["haiku.rag-slim[s3]==0.51.0"]
-cross-encoder = ["haiku.rag-slim[cross-encoder]==0.51.0"]
-ingester = ["haiku.rag-slim[ingester]==0.51.0"]
+s3 = ["haiku.rag-slim[s3]==0.52.0"]
+cross-encoder = ["haiku.rag-slim[cross-encoder]==0.52.0"]
+ingester = ["haiku.rag-slim[ingester]==0.52.0"]
 
 [build-system]
 requires = ["hatchling"]
diff --git a/uv.lock b/uv.lock
index d9df4240..27ec8522 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1457,7 +1457,7 @@ wheels = [
 
 [[package]]
 name = "haiku-rag"
-version = "0.51.0"
+version = "0.52.0"
 source = { editable = "." }
 dependencies = [
     { name = "haiku-rag-slim", extra = ["cohere", "cross-encoder", "docling", "mxbai", "tui", "voyageai", "zeroentropy"] },
@@ -1524,7 +1524,7 @@ dev = [
 
 [[package]]
 name = "haiku-rag-evals"
-version = "0.51.0"
+version = "0.52.0"
 source = { editable = "evaluations" }
 dependencies = [
     { name = "datasets" },
@@ -1547,7 +1547,7 @@ requires-dist = [
 
 [[package]]
 name = "haiku-rag-slim"
-version = "0.51.0"
+version = "0.52.0"
 source = { editable = "haiku_rag_slim" }
 dependencies = [
     { name = "docling-core" },