diff --git a/integration/compress.sh b/integration/compress.sh
index 2353c93d..450eb116 100644
--- a/integration/compress.sh
+++ b/integration/compress.sh
@@ -1,8 +1,14 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-folder="${1:?Usage: $0 <folder> [min-size]  (e.g. $0 ./logs 1MB)}"
-min_size="${2:-0}"
+keep=false
+args=()
+for arg in "$@"; do
+    if [[ "$arg" == "--keep" ]]; then keep=true; else args+=("$arg"); fi
+done
+
+folder="${args[0]:?Usage: $0 [--keep] <folder> [min-size]  (e.g. $0 ./logs 1MB)}"
+min_size="${args[1]:-0}"
 
 # numfmt accepts K/M/G but not KB/MB/GB — strip trailing B after a unit letter
 normalized=$(echo "$min_size" | tr '[:lower:]' '[:upper:]' | sed 's/\([KMGT]\)B$/\1/')
@@ -12,11 +18,11 @@ min_bytes=$(numfmt --from=iec "$normalized") || {
     exit 1
 }
 
-find "$folder" -maxdepth 1 -type f ! -name "*.tar" -print0 | while IFS= read -r -d '' file; do
+find "$folder" -maxdepth 1 -type f -name "*.json" -print0 | while IFS= read -r -d '' file; do
     file_size=$(stat -c%s "$file")
     if (( file_size >= min_bytes )); then
         tar -cjf "${file%.*}.tar" -C "$(dirname "$(realpath "$file")")" "$(basename "$file")"
-        rm "$file"
+        $keep || rm "$file"
         echo "Compressed: $(basename "$file")"
     fi
 done
diff --git a/integration/decompress.sh b/integration/decompress.sh
index f5d3e8a7..59004d1b 100644
--- a/integration/decompress.sh
+++ b/integration/decompress.sh
@@ -1,13 +1,19 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-folder="${1:?Usage: $0 <folder>}"
+keep=false
+args=()
+for arg in "$@"; do
+    if [[ "$arg" == "--keep" ]]; then keep=true; else args+=("$arg"); fi
+done
+
+folder="${args[0]:?Usage: $0 [--keep] <folder>}"
 
 find "$folder" -maxdepth 1 -type f -name "*.tar" -print0 | while IFS= read -r -d '' file; do
     base=$(basename "$file" .tar)
     inner=$(tar -tf "$file" | head -1)
     tar -xf "$file" -C "$folder"
     [[ "$folder/$inner" != "$folder/${base}.json" ]] && mv "$folder/$inner" "$folder/${base}.json"
-    rm "$file"
+    $keep || rm "$file"
     echo "Extracted: ${base}.json"
 done
diff --git a/integration/mainnet/eth_call@archive-index/README.md b/integration/mainnet/eth_call@archive-index/README.md
new file mode 100644
index 00000000..0a304128
--- /dev/null
+++ b/integration/mainnet/eth_call@archive-index/README.md
@@ -0,0 +1,36 @@
+# Archive-index probe tests
+
+`eth_call` tests that stress a node's **historical state (archive) read path**. Each test reads a set of accounts and storage slots touched in some historical block, replaying them *as of* an older block — forcing many value-at-block-N lookups. The call returns a 4-word fingerprint; a matching response makes it highly likely the archive index resolved the full read set identically.
+
+### Naming
+
+```
+test_archive-index-<baseBlock>-<queryBlock>.json
+```
+
+- `baseBlock` — block whose touched set was sourced (which accounts/slots to read).
+- `queryBlock` — block at which the read set is replayed (`queryBlock <= baseBlock`).
+
+## What a single request does
+
+One `eth_call` at `queryBlock` with a `stateOverride`-injected driver contract. Returns a 4-word struct:
+
+| Word | Meaning |
+|------|---------|
+| 0 | `accountFingerprint` — XOR of every account balance read |
+| 1 | `storageFingerprint` — XOR of every storage slot value read |
+| 2 | `nonZeroAccounts` — count of non-zero balances |
+| 3 | `nonZeroSlots` — count of non-zero storage slots |
+
+**Accounts.** The driver runs `BALANCE` on each sourced account, XOR-folding results into `accountFingerprint`.
+
+**Storage.** Since `SLOAD` only reads the executing contract's own storage, each sourced contract's code is replaced (via `stateOverride`) with a slot-reader stub; the driver `STATICCALL`s into each one. Only code is replaced — historical storage is preserved, so every `SLOAD` resolves through the archive index at `queryBlock`.
+
+The bytecode is injected as runtime code at a synthetic address, so EIP-170/3860 size caps don't apply and a full block's read set fits in one call.
+
+## How the tests were generated
+
+1. **Source the touched set.** Accounts and storage slots accessed in `baseBlock`, collected via `prestateTracer` (`debug_traceBlockByNumber`) when available, otherwise via `eth_createAccessList` against `baseBlock - 1`. `from`/`to` participants are always included.
+2. **Cap and shuffle.** Shuffled (seeded by block number, so reproducible) and capped to fixed limits (~1000 accounts, ~6000 slots per call).
+3. **Build the ladder.** The same read set is turned into one `eth_call` per query-depth rung, each at a different `queryBlock`.
+4. **Capture the oracle.** Each request is sent to a reference archive node; the response is recorded verbatim as the expected `result`.
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