Fix unused BACKGROUND_LINKS import warnings in benchmarks

Moved BACKGROUND_LINKS imports from module-level to inside bench! macro
bodies where they are actually used. This eliminates 6 compiler warnings
that appeared in CI run #20465184821.

The bench! macro already imports BACKGROUND_LINKS internally (lib.rs:18),
so module-level imports were redundant. Now each benchmark that uses
BACKGROUND_LINKS explicitly imports it within the macro body.

Fixes warnings in:
- benches/benchmarks/delete.rs
- benches/benchmarks/update.rs
- benches/benchmarks/each/concrete.rs
- benches/benchmarks/each/identity.rs
- benches/benchmarks/each/incoming.rs
- benches/benchmarks/each/outgoing.rs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: konard

rust/benches/benchmarks/delete.rs

@@ -7,7 +7,7 @@ use {
         split::{self, DataPart, IndexPart},
         unit, Doublets,
     },
-    linksneo4j::{bench, connect, Benched, Client, Exclusive, Fork, Transaction, BACKGROUND_LINKS, LINK_COUNT},
+    linksneo4j::{bench, connect, Benched, Client, Exclusive, Fork, Transaction, LINK_COUNT},
     std::{
         alloc::Global,
         time::{Duration, Instant},
@@ -21,6 +21,7 @@ fn bench<B: Benched + Doublets<usize>>(
 ) {
     group.bench_function(id, |bencher| {
         bench!(|fork| as B {
+            use linksneo4j::BACKGROUND_LINKS;
             // Create additional links beyond background links to delete
             for _prepare in BACKGROUND_LINKS..BACKGROUND_LINKS + LINK_COUNT {
                 let _ = fork.create_point();

rust/benches/benchmarks/each/concrete.rs

@@ -8,7 +8,7 @@ use {
         split::{self, DataPart, IndexPart},
         unit, Doublets,
     },
-    linksneo4j::{bench, connect, Benched, Client, Exclusive, Fork, Transaction, BACKGROUND_LINKS},
+    linksneo4j::{bench, connect, Benched, Client, Exclusive, Fork, Transaction},
     std::{
         alloc::Global,
         time::{Duration, Instant},
@@ -24,6 +24,7 @@ fn bench<B: Benched + Doublets<usize>>(
     let any = LinksConstants::new().any;
     group.bench_function(id, |bencher| {
         bench!(|fork| as B {
+            use linksneo4j::BACKGROUND_LINKS;
             // Query all background links by concrete source/target
             for index in 1..=BACKGROUND_LINKS {
                 elapsed! {fork.each_by([any, index, index], handler)};

rust/benches/benchmarks/each/identity.rs

@@ -8,7 +8,7 @@ use {
         split::{self, DataPart, IndexPart},
         unit, Doublets,
     },
-    linksneo4j::{bench, connect, Benched, Client, Exclusive, Fork, Transaction, BACKGROUND_LINKS},
+    linksneo4j::{bench, connect, Benched, Client, Exclusive, Fork, Transaction},
     std::{
         alloc::Global,
         time::{Duration, Instant},
@@ -24,6 +24,7 @@ fn bench<B: Benched + Doublets<usize>>(
     let any = LinksConstants::new().any;
     group.bench_function(id, |bencher| {
         bench!(|fork| as B {
+            use linksneo4j::BACKGROUND_LINKS;
             // Query all background links by identity
             for index in 1..=BACKGROUND_LINKS {
                 elapsed! {fork.each_by([index, any, any], handler)};

rust/benches/benchmarks/each/incoming.rs

@@ -8,7 +8,7 @@ use {
         split::{self, DataPart, IndexPart},
         unit, Doublets,
     },
-    linksneo4j::{bench, connect, Benched, Client, Exclusive, Fork, Transaction, BACKGROUND_LINKS},
+    linksneo4j::{bench, connect, Benched, Client, Exclusive, Fork, Transaction},
     std::{
         alloc::Global,
         time::{Duration, Instant},
@@ -24,6 +24,7 @@ fn bench<B: Benched + Doublets<usize>>(
     let any = LinksConstants::new().any;
     group.bench_function(id, |bencher| {
         bench!(|fork| as B {
+            use linksneo4j::BACKGROUND_LINKS;
             // Query all background links by incoming (target)
             for index in 1..=BACKGROUND_LINKS {
                 elapsed! {fork.each_by([any, any, index], handler)};

rust/benches/benchmarks/each/outgoing.rs

@@ -8,7 +8,7 @@ use {
         split::{self, DataPart, IndexPart},
         unit, Doublets,
     },
-    linksneo4j::{bench, connect, Benched, Client, Exclusive, Fork, Transaction, BACKGROUND_LINKS},
+    linksneo4j::{bench, connect, Benched, Client, Exclusive, Fork, Transaction},
     std::{
         alloc::Global,
         time::{Duration, Instant},
@@ -24,6 +24,7 @@ fn bench<B: Benched + Doublets<usize>>(
     let any = LinksConstants::new().any;
     group.bench_function(id, |bencher| {
         bench!(|fork| as B {
+            use linksneo4j::BACKGROUND_LINKS;
             // Query all background links by outgoing (source)
             for index in 1..=BACKGROUND_LINKS {
                 let _ = elapsed! {fork.each_by([any, index, any], handler)};

rust/benches/benchmarks/update.rs

@@ -7,7 +7,7 @@ use {
         split::{self, DataPart, IndexPart},
         unit, Doublets,
     },
-    linksneo4j::{bench, connect, Benched, Client, Exclusive, Fork, Transaction, BACKGROUND_LINKS, LINK_COUNT},
+    linksneo4j::{bench, connect, Benched, Client, Exclusive, Fork, Transaction, LINK_COUNT},
     std::{
         alloc::Global,
         time::{Duration, Instant},
@@ -21,6 +21,7 @@ fn bench<B: Benched + Doublets<usize>>(
 ) {
     group.bench_function(id, |bencher| {
         bench!(|fork| as B {
+            use linksneo4j::BACKGROUND_LINKS;
             // Update the last LINK_COUNT links from background links
             let start_id = if BACKGROUND_LINKS > LINK_COUNT { BACKGROUND_LINKS - LINK_COUNT + 1 } else { 1 };
             for id in start_id..=BACKGROUND_LINKS {