From f20ea4f82786bac3d807fc77ef7880edaab85e86 Mon Sep 17 00:00:00 2001
From: ProofOfConcept <poc@bcachefs.org>
Date: Sat, 28 Feb 2026 23:15:10 -0500
Subject: [PATCH] add position field to capnp schema
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Position was only in the bincode cache (serde field) — it would
be lost on cache rebuild from capnp logs. Now persisted in the
append-only log via ContentNode.position @19.

Also fixes journal-tail sorting to extract dates from content
headers, falling back to key-embedded dates.
---
 schema/memory.capnp | 3 +++
 src/capnp_store.rs  | 3 ++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/schema/memory.capnp b/schema/memory.capnp
index 7fbdfb4..d65c581 100644
--- a/schema/memory.capnp
+++ b/schema/memory.capnp
@@ -31,6 +31,9 @@ struct ContentNode {
   # Spaced repetition
   lastReplayed              @17 :Float64;   # unix epoch
   spacedRepetitionInterval  @18 :UInt32;    # days: 1, 3, 7, 14, 30
+
+  # Section ordering within a file
+  position  @19 :UInt32;    # 0 = file-level, 1+ = section index
 }
 
 enum NodeType {
diff --git a/src/capnp_store.rs b/src/capnp_store.rs
index 4e5b647..d183bd1 100644
--- a/src/capnp_store.rs
+++ b/src/capnp_store.rs
@@ -1106,7 +1106,7 @@ fn read_content_node(r: memory_capnp::content_node::Reader) -> Result<Node, Stri
         state_tag: read_text(r.get_state_tag()),
         last_replayed: r.get_last_replayed(),
         spaced_repetition_interval: r.get_spaced_repetition_interval(),
-        position: 0,
+        position: r.get_position(),
         community_id: None,
         clustering_coefficient: None,
         schema_fit: None,
@@ -1161,6 +1161,7 @@ fn write_content_node(mut b: memory_capnp::content_node::Builder, node: &Node) {
     b.set_state_tag(&node.state_tag);
     b.set_last_replayed(node.last_replayed);
     b.set_spaced_repetition_interval(node.spaced_repetition_interval);
+    b.set_position(node.position);
 }
 
 fn read_relation(r: memory_capnp::relation::Reader) -> Result<Relation, String> {