diff --git a/default.nix b/default.nix
index 01ecf46..6f306ac 100644
--- a/default.nix
+++ b/default.nix
@@ -88,7 +88,7 @@ lib.makeScope pkgs.newScope (
     datasette-settings = self.callPackage (
       { formats }:
       (formats.json { }).generate "datasette-settings.json" {
-        sql_time_limit_ms = 8000;
+        sql_time_limit_ms = 16000;
       }
     ) { };
     datasette-metadata = self.callPackage (
@@ -122,38 +122,18 @@ lib.makeScope pkgs.newScope (
                 <code>CudaArtifact</code>s (identified by <code>sha256</code>)
                 claiming the same <code>(pname, version, platform)</code> triple
               '';
-              sql = ''
-                SELECT
-                  COUNT(DISTINCT sha256) AS conflicts,
-                  pname.str AS pname,
-                  ver.str AS ver,
-                  plat.str AS plat,
-                  GROUP_CONCAT(name.str, char(10)) AS name,
-                  GROUP_CONCAT(tag.str, char(10)) AS tag,
-                  GROUP_CONCAT(h.hash, char(10)) AS sha256
-                FROM
-                  (
-                    CudaArtifact AS cc,
-                    Str AS name,
-                    Str AS pname,
-                    Str as ver,
-                    Str as plat,
-                    Hash as h
-                    ON  cc.name=name.id
-                    AND cc.pname=pname.id
-                    AND cc.version = ver.id
-                    AND cc.platform = plat.id
-                    AND cc.sha256 = h.id
-                  )
-                  LEFT JOIN Str AS tag
-                ON
-                  cc.compat_tag=tag.id
-                GROUP BY
-                  cc.pname, cc.version, cc.platform
-                HAVING
-                  conflicts >= CAST(:min_conflicts AS INTEGER)
-                ORDER BY conflicts DESC
+              sql = builtins.readFile ./src/q/summary-cuda-conflicts.sql;
+            };
+            queries.cuda_pnames = {
+              title = "Known CUDA Artifacts";
+              description_html = ''
+                Overview of known CUDA artifacts sorted by <code>pname</code>
               '';
+              sql = builtins.readFile ./src/q/summary-cuda-pnames.sql;
+            };
+            queries.cuda_platforms = {
+              title = "CUDA: Supported Platforms ";
+              sql = builtins.readFile ./src/q/summary-cuda-platforms.sql;
             };
           };
         };
diff --git a/src/main.rs b/src/main.rs
index ec3a3e5..0036224 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -186,7 +186,7 @@ async fn open_context(
     }
 
     let con = rusqlite::Connection::open(&db_path).expect("Failed to construct Database object");
-    con.pragma_update(None, "jorunal_mode", "wal").unwrap();
+    con.pragma_update(None, "journal_mode", "wal").unwrap();
     con.pragma_update(None, "synchronous", "normal").unwrap();
     con.pragma_update(None, "temp_store", "memory").unwrap();
     con.pragma_update(None, "foreign_keys", "on").unwrap();
@@ -238,6 +238,86 @@ where
     }
 }
 
+trait ConnectionLike {
+    #[allow(dead_code)]
+    fn execute<P: rusqlite::Params>(&self, sql: &str, params: P) -> rusqlite::Result<usize>;
+    fn prepare_cached(&self, sql: &str) -> rusqlite::Result<rusqlite::CachedStatement<'_>>;
+}
+
+impl ConnectionLike for rusqlite::Connection {
+    fn execute<P: rusqlite::Params>(&self, sql: &str, params: P) -> rusqlite::Result<usize> {
+        <rusqlite::Connection>::execute(self, sql, params)
+    }
+
+    fn prepare_cached(&self, sql: &str) -> rusqlite::Result<rusqlite::CachedStatement<'_>> {
+        <rusqlite::Connection>::prepare_cached(self, sql)
+    }
+}
+
+impl<'a> ConnectionLike for rusqlite::Transaction<'a> {
+    fn execute<P: rusqlite::Params>(&self, sql: &str, params: P) -> rusqlite::Result<usize> {
+        <rusqlite::Connection>::execute(self, sql, params)
+    }
+
+    fn prepare_cached(&self, sql: &str) -> rusqlite::Result<rusqlite::CachedStatement<'_>> {
+        <rusqlite::Connection>::prepare_cached(self, sql)
+    }
+}
+
+impl<'a> ConnectionLike for rusqlite::Savepoint<'a> {
+    fn execute<P: rusqlite::Params>(&self, sql: &str, params: P) -> rusqlite::Result<usize> {
+        <rusqlite::Connection>::execute(self, sql, params)
+    }
+
+    fn prepare_cached(&self, sql: &str) -> rusqlite::Result<rusqlite::CachedStatement<'_>> {
+        <rusqlite::Connection>::prepare_cached(self, sql)
+    }
+}
+
+fn db_add_sample(
+    tx: &mut rusqlite::Transaction<'_>,
+    uri: &str,
+    hash: &Option<String>,
+    http_code: &Option<u16>,
+    content_type: &Option<String>,
+) -> Result<(u32, u32), Error> {
+    let mut sp = tx.savepoint().context("db_add_sample")?;
+    sp.set_drop_behavior(rusqlite::DropBehavior::Commit);
+    {
+        if let Some(h) = hash {
+            db_add_blob(&mut sp, &h.clone(), None)?;
+        };
+        let mut add_sample = sp
+            .prepare_cached(include_str!("q/add-sample.sql"))
+            .context("Failed to prepare add-sample.sql")?;
+        return Ok(add_sample.query_row(
+            named_params! {
+                ":uri": uri,
+                ":hash": hash,
+                ":http_code": http_code,
+                ":content_type": content_type
+            },
+            |row| <(u32, u32)>::try_from(row),
+        )?);
+    }
+}
+fn db_add_blob<Con: ConnectionLike>(
+    con: &mut Con,
+    hash: &str,
+    n_bytes: Option<u64>,
+) -> Result<usize, Error> {
+    let mut add_blob = con
+        .prepare_cached(include_str!("q/upsert-blob.sql"))
+        .context("Failed to prepare upsert-blob.sql")?;
+    Ok(add_blob.execute(params![hash, n_bytes,])?)
+}
+fn db_add_uri<Con: ConnectionLike>(con: &mut Con, uri: &str) -> Result<usize, Error> {
+    let mut add_uri = con
+        .prepare_cached(include_str!("q/upsert-uri.sql"))
+        .context("Failed to prepare upsert-uri.sql")?;
+    Ok(add_uri.execute(params![uri])?)
+}
+
 impl<BS: BlobService + Clone, DS: DirectoryService + Clone> SidxContext<BS, DS> {
     async fn latest_sample(&self, uri: &str) -> Result<Option<Sampled>, Error> {
         let lock = self.con.lock().unwrap();
@@ -265,42 +345,6 @@ impl<BS: BlobService + Clone, DS: DirectoryService + Clone> SidxContext<BS, DS>
                 None => Ok(None),
             })
     }
-    async fn db_add_sample(
-        &self,
-        uri: &str,
-        hash: &Option<String>,
-        http_code: &Option<u16>,
-        content_type: &Option<String>,
-    ) -> Result<(u32, u32), Error> {
-        let lock = self.con.lock().expect("Locking mutex for db_add_sample");
-        let mut add_sample = lock
-            .prepare_cached(include_str!("q/add-sample.sql"))
-            .context("Failed to prepare add-sample.sql")?;
-        Ok(add_sample.query_row(
-            named_params! {
-                ":uri": uri,
-                ":hash": hash,
-                ":http_code": http_code,
-                ":content_type": content_type
-            },
-            |row| <(u32, u32)>::try_from(row),
-        )?)
-    }
-    async fn db_add_blob(&self, hash: &str, n_bytes: u64) -> Result<usize, Error> {
-        let lock = self.con.lock().expect("db_add_blob: couldn't lock mutex?");
-        let mut add_blob = lock
-            .prepare_cached(include_str!("q/upsert-blob.sql"))
-            .context("Failed to prepare upsert-blob.sql")?;
-        Ok(add_blob.execute(params![hash, n_bytes,])?)
-    }
-    async fn db_add_uri(&self, uri: &str) -> Result<usize, Error> {
-        let lock = self.con.lock().unwrap();
-        let mut add_uri = lock
-            .prepare_cached(include_str!("q/upsert-uri.sql"))
-            .context("Failed to prepare upsert-uri.sql")?;
-
-        Ok(add_uri.execute(params![uri])?)
-    }
     async fn record_ingested_node(
         &self,
         uri: &str,
@@ -308,25 +352,28 @@ impl<BS: BlobService + Clone, DS: DirectoryService + Clone> SidxContext<BS, DS>
         http_code: Option<u16>,
         content_type: Option<String>,
     ) -> Result<Sampled, Error> {
-        let digest64 = if let Some(SizedBlob { hash, n_bytes }) = blob {
-            let digest64 = format!("{}", hash);
-            self.db_add_blob(&digest64, n_bytes.clone()).await?;
-            Some(digest64)
-        } else {
-            None
-        };
-        self.db_add_uri(&uri).await?;
-        let (sample_id, epoch) = self
-            .db_add_sample(&uri, &digest64, &http_code, &content_type)
-            .await?;
-        Ok(Sampled {
-            sample_id,
-            uri: uri.to_string(),
-            blob: blob.clone(),
-            http_status: http_code,
-            epoch,
-            when: SampledWhen::Now,
-        })
+        let mut lock = self.con.lock().unwrap();
+        let mut tx = lock.transaction()?;
+        {
+            let digest64 = if let Some(SizedBlob { hash, n_bytes }) = blob {
+                let digest64 = format!("{}", hash);
+                db_add_blob(&mut tx, &digest64, Some(n_bytes.clone()))?;
+                Some(digest64)
+            } else {
+                None
+            };
+            db_add_uri(&mut tx, &uri)?;
+            let (sample_id, epoch) =
+                db_add_sample(&mut tx, &uri, &digest64, &http_code, &content_type)?;
+            Ok(Sampled {
+                sample_id,
+                uri: uri.to_string(),
+                blob: blob.clone(),
+                http_status: http_code,
+                epoch,
+                when: SampledWhen::Now,
+            })
+        }
     }
     async fn download(&self, uri: &Url) -> Result<Sampled, Error> {
         let _permit = self.http_semaphore.acquire().await.unwrap();
diff --git a/src/q/summary-cuda-conflicts.sql b/src/q/summary-cuda-conflicts.sql
new file mode 100644
index 0000000..539e071
--- /dev/null
+++ b/src/q/summary-cuda-conflicts.sql
@@ -0,0 +1,34 @@
+SELECT
+  COUNT(DISTINCT sha256) AS conflicts,
+  pname.str AS pname,
+  ver.str AS ver,
+  plat.str AS plat,
+  GROUP_CONCAT(name.str, char(10)) AS name,
+  GROUP_CONCAT(IFNULL(tag.str, char(0x274C)), char(10)) AS tag,
+  GROUP_CONCAT(h.hash, char(10)) AS sha256
+FROM
+  (
+    CudaArtifact AS cc,
+    Str AS name,
+    Str AS pname,
+    Str as ver,
+    Str as plat,
+    Hash as h ON cc.name = name.id
+    AND cc.pname = pname.id
+    AND cc.version = ver.id
+    AND cc.platform = plat.id
+    AND cc.sha256 = h.id
+  )
+  LEFT JOIN Str AS tag ON cc.compat_tag = tag.id
+GROUP BY
+  cc.pname,
+  cc.version,
+  cc.platform
+HAVING
+  conflicts >= CAST(:min_conflicts AS INTEGER)
+ORDER BY
+  conflicts DESC,
+  cc.pname,
+  cc.version,
+  cc.platform,
+  tag.str
diff --git a/src/q/summary-cuda-platforms.sql b/src/q/summary-cuda-platforms.sql
new file mode 100644
index 0000000..ccac735
--- /dev/null
+++ b/src/q/summary-cuda-platforms.sql
@@ -0,0 +1,73 @@
+WITH PerQuadruple AS (
+  SELECT
+    pname.str AS pname,
+    IFNULL(ver.str, char(0x274C)) AS version,
+    plat.str AS platform,
+    IFNULL(ct.str, char(0x274C)) AS tag,
+    COUNT(DISTINCT sha256.hash) AS uq_sha256s
+  FROM
+    (
+      CudaArtifact AS ca,
+      Str AS pname,
+      Str AS plat,
+      Hash AS sha256 ON ca.pname = pname.id
+      AND ca.platform = plat.id
+      AND sha256.id = ca.sha256
+    )
+    LEFT JOIN Str AS ver ON ver.id = ca.version
+    LEFT JOIN Str AS ct ON ca.compat_tag = ct.id
+  GROUP BY
+    pname.id,
+    version,
+    platform,
+    tag
+  ORDER BY
+    uq_sha256s DESC,
+    pname.str,
+    version,
+    plat.str,
+    tag
+),
+ByPname AS (
+  SELECT
+    pname,
+    REPLACE(GROUP_CONCAT(DISTINCT pq.version), ',', char(10)) AS versions,
+    REPLACE(
+      GROUP_CONCAT(DISTINCT pq.platform),
+      ',',
+      char(10)
+    ) AS platforms,
+    REPLACE(GROUP_CONCAT(DISTINCT pq.tag), ',', char(10)) AS tags,
+    SUM(pq.uq_sha256s) AS uq_sha256s
+  FROM
+    PerQuadruple AS pq
+  GROUP BY
+    pq.pname
+),
+VersionGroups AS (
+  SELECT
+    REPLACE(GROUP_CONCAT(DISTINCT pname), ',', char(10)) AS pnames,
+    versions
+  FROM
+    ByPname AS bp
+  GROUP BY
+    versions
+  ORDER BY
+    LENGTH(pnames) DESC
+),
+PlatformGroups AS (
+  SELECT
+    REPLACE(GROUP_CONCAT(DISTINCT pname), ',', char(10)) AS pnames,
+    platforms
+  FROM
+    ByPname AS bp
+  GROUP BY
+    platforms
+  ORDER BY
+    LENGTH(platforms) DESC,
+    LENGTH(pnames)
+)
+SELECT
+  *
+FROM
+  PlatformGroups
diff --git a/src/q/summary-cuda-pnames.sql b/src/q/summary-cuda-pnames.sql
new file mode 100644
index 0000000..68f2272
--- /dev/null
+++ b/src/q/summary-cuda-pnames.sql
@@ -0,0 +1,87 @@
+WITH PerQuadruple AS (
+  SELECT
+    pname.str AS pname,
+    IFNULL(ver.str, char(0x274C)) AS version,
+    plat.str AS platform,
+    IFNULL(ct.str, char(0x274C)) AS tag,
+    COUNT(DISTINCT sha256.hash) AS uq_sha256s
+  FROM
+    (
+      CudaArtifact AS ca,
+      Str AS pname,
+      Str AS plat,
+      Hash AS sha256 ON ca.pname = pname.id
+      AND ca.platform = plat.id
+      AND sha256.id = ca.sha256
+    )
+    LEFT JOIN Str AS ver ON ver.id = ca.version
+    LEFT JOIN Str AS ct ON ca.compat_tag = ct.id
+  GROUP BY
+    pname.id,
+    version,
+    platform,
+    tag
+  ORDER BY
+    uq_sha256s DESC,
+    pname.str,
+    version,
+    plat.str,
+    tag
+)
+SELECT
+  pname,
+  (
+    SELECT
+      GROUP_CONCAT(x, char(10))
+    FROM
+      (
+        SELECT
+          DISTINCT version AS x
+        FROM
+          PerQuadruple
+        WHERE
+          pname = pq.pname
+        ORDER BY
+          x
+      )
+  ) AS versions,
+  (
+    SELECT
+      GROUP_CONCAT(x, char(10))
+    FROM
+      (
+        SELECT
+          DISTINCT platform AS x
+        FROM
+          PerQuadruple
+        WHERE
+          pname = pq.pname
+        ORDER BY
+          x
+      )
+  ) AS platforms,
+  (
+    SELECT
+      GROUP_CONCAT(x, char(10))
+    FROM
+      (
+        SELECT
+          DISTINCT tag AS x
+        FROM
+          PerQuadruple
+        WHERE
+          pname = pq.pname
+        ORDER BY
+          x
+      )
+  ) AS tags,
+  (
+    SELECT
+      SUM(uq_sha256s)
+    FROM
+      PerQuadruple
+    WHERE
+      pname = pq.pname
+  ) AS uq_sha256s
+FROM
+  PerQuadruple AS pq