diff --git a/lib/Command/AI.php b/lib/Command/AI.php
index e02e7120a..e63198d84 100644
--- a/lib/Command/AI.php
+++ b/lib/Command/AI.php
@@ -23,8 +23,8 @@
 
 namespace OCA\Memories\Command;
 
-use OC\DB\QueryBuilder\QueryBuilder;
 use OCA\Memories\Db\FsManager;
+use OCA\Memories\Db\SQL;
 use OCA\Memories\Db\TimelineQuery;
 use OCA\Memories\Db\TimelineRoot;
 use OCA\Memories\Util;
@@ -43,6 +43,7 @@
 
 const API_IMAGES = '/images';
 const API_TEXT = '/text';
+const VECTOR_SIZE = 768;
 
 class AIOpts
 {
@@ -85,24 +86,21 @@ public function search(string $prompt): array
         $query = $this->connection->getQueryBuilder();
 
         $classlist = array_map(static fn (array $class): int => $class['index'], $response['classes']);
-        // $classlist = array_slice($classlist, 0, 1);
+        // $classlist = \array_slice($classlist, 0, 8);
 
         $classQuery = $this->connection->getQueryBuilder();
         $classQuery->select('c.word')
             ->from('memories_ss_class', 'c')
-            ->where($query->expr()->andX(
-                $query->expr()->eq('c.fileid', 'v.fileid'),
-                $query->expr()->orX(
-                    ...array_map(static fn ($idx) =>
-                        $query->expr()->eq('c.class', $query->expr()->literal($idx)),
-                        $classlist)
-                ),
-            ));
+            ->where($classQuery->expr()->andX(
+                $classQuery->expr()->eq('c.fileid', 'v.fileid'),
+                $classQuery->expr()->in('c.class', array_map(static fn ($idx) => $classQuery->expr()->literal($idx), $classlist)),
+            ))
+        ;
 
         $subquery = $this->connection->getQueryBuilder();
         $subquery->select('v.fileid')
             ->from('memories_ss_vectors', 'v')
-            ->where($subquery->createFunction("EXISTS ({$classQuery->getSql()})"))
+            ->where(SQL::exists($query, $classQuery))
             ->groupBy('v.fileid')
         ;
 
@@ -110,66 +108,71 @@ public function search(string $prompt): array
         $components = [];
         foreach ($response['embedding'] as $i => $value) {
             $value = number_format($value, 6);
-            $components[] = "v.v{$i}*{$value}";
+            $components[] = "(v.v{$i}*({$value}))";
         }
 
-        // Divide the operators into chunks of 96 each
-        $sums = array_chunk($components, 96);
+        // Divide the operators into chunks of 48 each
+        $sums = array_chunk($components, 48);
 
         // Add the sum of each chunk
         for ($i = 0; $i < \count($sums); ++$i) {
-            $sum = implode('+', $sums[$i]);
-            $subquery->addSelect($subquery->createFunction("({$sum}) as score{$i}"));
+            $sum = $subquery->createFunction(implode('+', $sums[$i]));
+            $subquery->selectAlias($sum, "score{$i}");
         }
 
         // Create outer query
         $query->select('sq.fileid')
-            ->from($query->createFunction("({$subquery->getSQL()}) sq"))
+            ->from(SQL::subquery($query, $subquery, 'sq'))
         ;
 
         // Add all score sums together
-        $sum = implode('+', array_map(static fn ($_, $i) => "score{$i}", $sums, array_keys($sums)));
-        $query->addSelect($query->createFunction("({$sum}) as score"));
+        $finalSum = implode('+', array_map(static fn ($_, $i) => "score{$i}", $sums, array_keys($sums)));
+        $finalSum = $query->createFunction("({$finalSum})");
+        $query->selectAlias($finalSum, 'score');
 
         // Filter for scores less than 1
-        // $query->andWhere($query->createFunction("(({$sum}) > 0.04)"));
+        $query = SQL::materialize($query, 'fsq');
+        $query->andWhere($query->expr()->gt('fsq.score', $query->expr()->literal(0.04)));
 
-        $query->orderBy('score', 'DESC');
+        $query->orderBy('fsq.score', 'DESC');
 
         // $query->setMaxResults(8); // batch size
-        header('Content-Type: text/html');
+
+        // SQL::debugQuery($query);
 
         $t1 = microtime(true);
+
         $res = $query->executeQuery()->fetchAll();
 
         // print length and discard after 10
-        echo "<h1>Results: ".\count($res)."</h1>";
-        $res = array_slice($res, 0, 10);
+        echo '<h1>Results: '.\count($res).'</h1>';
+        $res = \array_slice($res, 0, 10);
 
         $t2 = microtime(true);
-        echo "<h1>Search took ".(($t2 - $t1)*1000)." ms</h1>";
-        echo "class list: ".json_encode($response['classes'])."<br>";
+        echo '<h1>Search took '.(($t2 - $t1) * 1000).' ms</h1>';
+        echo 'class list: '.json_encode($response['classes']).'<br>';
 
         foreach ($res as &$row) {
             $fid = $row['fileid'] = (int) $row['fileid'];
             $row['score'] = (float) $row['score'];
 
-            $row['score'] = pow(2, $row['score'] * 40);
+            $row['score'] = 2 ** ($row['score'] * 40);
 
             $p = $this->preview->getPreview($this->fs->getUserFile($fid), 1024, 1024);
             $data = $p->getContent();
 
-            //get classes for this file
+            // get classes for this file
             $q = $this->connection->getQueryBuilder();
             $w = $q->select('word')
                 ->from('memories_ss_class', 'c')
                 ->where($q->expr()->eq('c.fileid', $q->createNamedParameter($fid)))
                 ->executeQuery()
-                ->fetchAll(\PDO::FETCH_COLUMN);
+                ->fetchAll(\PDO::FETCH_COLUMN)
+            ;
 
-            echo "<h2>Score: ". $row['score'] . "</h2>";
-            echo "Row: ".json_encode($row)."<br>";
-            echo "Classes: ".json_encode($w)."</br>";
+            echo '<h2>Score: '.$row['score'].'</h2>';
+            echo 'Row: '.json_encode($row).'<br>';
+            echo 'Classes: '.json_encode($w).'</br>';
             echo "<img src='data:image/jpeg;base64,".base64_encode($data)."'>";
         }
 
@@ -227,14 +230,18 @@ private function indexUser(IUser $user): void
                 ->from('memories', 'm')
             ;
 
-            $this->tq->joinFilecache($query, $root, true, false, true);
+            $query = $this->tq->filterFilecache($query, $root, true, false, true);
 
             // Filter by the files that are not indexed by the AI
-            $query
-                ->leftJoin('m', 'memories_ss_vectors', 'v', $query->expr()->eq('m.fileid', 'v.fileid'))
-                ->where($query->expr()->isNull('v.fileid'))
-                ->setMaxResults(16) // batch size
+            $vecSq = $this->connection->getQueryBuilder();
+            $vecSq->select($vecSq->expr()->literal(1))
+                ->from('memories_ss_vectors', 'v')
+                ->where($vecSq->expr()->eq('m.fileid', 'v.fileid'))
             ;
+            $query->andWhere(SQL::notExists($query, $vecSq));
+
+            // Batch size
+            $query->setMaxResults(16);
 
             // FileIds inside this folder that need indexing
             $objs = Util::transaction(fn () => $this->tq->executeQueryWithCTEs($query)->fetchAll());
@@ -256,21 +263,23 @@ private function indexSet(Folder $folder, array $objs): void
             return;
         }
 
-        $count = \count($objs);
-        $this->output->writeln("Indexing {$count} files");
-
+        // Get previews for all files
         foreach ($objs as &$obj) {
-            $obj['fileid'] = (int) $obj['fileid'];
+            $fileid = $obj['fileid'] = (int) $obj['fileid'];
             $obj['mtime'] = (int) $obj['mtime'];
 
             try {
                 // Get file object
                 $file = $folder->getById($obj['fileid']);
                 if (empty($file)) {
+                    $this->output->writeln("<error>File not found: {$fileid}</error>");
+
                     continue;
                 }
                 $file = $file[0];
                 if (!$file instanceof File) {
+                    $this->output->writeln("<error>Not a file: {$fileid}</error>");
+
                     continue;
                 }
 
@@ -285,13 +294,17 @@ private function indexSet(Folder $folder, array $objs): void
                 $mime = $preview->getMimeType();
                 $data = base64_encode($content);
                 $obj['image'] = "data:{$mime};base64,{$data}";
+
+                // Log
+                $this->output->writeln("Indexing {$file->getPath()}");
             } catch (\Exception $e) {
                 $obj['fileid'] = 0; // mark failure
-                $this->output->writeln("<error>Failed to get preview: {$e->getMessage()}</error>".PHP_EOL);
+                $this->output->writeln("<error>Failed to get preview: {$e->getMessage()}</error>");
             }
         }
 
         // Filter out failed files
+        // TODO: store failure reason
         $objs = array_filter($objs, static fn ($obj) => $obj['fileid'] > 0);
 
         // Post to server
@@ -327,11 +340,11 @@ private function indexSet(Folder $folder, array $objs): void
     private function ssStoreResult(array $result, int $fileid, int $mtime): void
     {
         // Check result
-        if (768 !== \count($result['embedding'])) {
+        if (VECTOR_SIZE !== \count($result['embedding'])) {
             throw new \Exception('Invalid embedding size');
         }
 
-        if (\count($result['classes']) === 0) {
+        if (0 === \count($result['classes'])) {
             throw new \Exception('No classes returned.');
         }
 
@@ -345,8 +358,8 @@ private function ssStoreResult(array $result, int $fileid, int $mtime): void
         ];
 
         // Store embedding
-        for ($i = 0; $i < \count($result['embedding']); ++$i) {
-            $values['v'.$i] = $query->expr()->literal($result['embedding'][$i]);
+        for ($i = 0; $i < VECTOR_SIZE; ++$i) {
+            $values["v{$i}"] = $query->expr()->literal($result['embedding'][$i]);
         }
 
         $query->insert('memories_ss_vectors')
diff --git a/lib/Db/SQL.php b/lib/Db/SQL.php
index fbde6917d..9e45f64dd 100644
--- a/lib/Db/SQL.php
+++ b/lib/Db/SQL.php
@@ -68,10 +68,11 @@ public static function materialize(IQueryBuilder $query, string $alias): IQueryB
      *
      * @param IQueryBuilder $query    The query to create the function on
      * @param IQueryBuilder $subquery The subquery to use
+     * @param string        $alias    The alias to use for the subquery
      */
-    public static function subquery(IQueryBuilder &$query, IQueryBuilder &$subquery): IQueryFunction
+    public static function subquery(IQueryBuilder &$query, IQueryBuilder &$subquery, string $alias = ''): IQueryFunction
     {
-        return $query->createFunction("({$subquery->getSQL()})");
+        return $query->createFunction("({$subquery->getSQL()}) {$alias}");
     }
 
     /**
diff --git a/lib/Migration/Version800000Date20240327191449.php b/lib/Migration/Version900000Date20240327191449.php
similarity index 72%
rename from lib/Migration/Version800000Date20240327191449.php
rename to lib/Migration/Version900000Date20240327191449.php
index b7c8d343e..ed00d97a2 100644
--- a/lib/Migration/Version800000Date20240327191449.php
+++ b/lib/Migration/Version900000Date20240327191449.php
@@ -28,12 +28,16 @@
 use OCP\Migration\IOutput;
 use OCP\Migration\SimpleMigrationStep;
 
-class Version800000Date20240327191449 extends SimpleMigrationStep
+class Version900000Date20240327191449 extends SimpleMigrationStep
 {
     /**
      * @param \Closure(): ISchemaWrapper $schemaClosure
      */
-    public function preSchemaChange(IOutput $output, \Closure $schemaClosure, array $options): void {}
+    public function preSchemaChange(IOutput $output, \Closure $schemaClosure, array $options): void
+    {
+        // Patch doctrine to use float instead of double
+        \Doctrine\DBAL\Types\Type::overrideType(Types::FLOAT, RealFloatType::class);
+    }
 
     /**
      * @param \Closure(): ISchemaWrapper $schemaClosure
@@ -58,10 +62,6 @@ public function changeSchema(IOutput $output, \Closure $schemaClosure, array $op
                 'notnull' => true,
                 'length' => 20,
             ]);
-            $table->addColumn('lsh', Types::INTEGER, [
-                'notnull' => true,
-                'default' => 0,
-            ]);
 
             // Create embedding columns
             $size = 768;
@@ -74,7 +74,6 @@ public function changeSchema(IOutput $output, \Closure $schemaClosure, array $op
 
             $table->setPrimaryKey(['id']);
             $table->addIndex(['fileid', 'mtime'], 'memories_ss_vec_fileid');
-            $table->addIndex(['lsh'], 'memories_ss_vec_lsh');
         }
 
         return $schema;
@@ -83,5 +82,26 @@ public function changeSchema(IOutput $output, \Closure $schemaClosure, array $op
     /**
      * @param \Closure(): ISchemaWrapper $schemaClosure
      */
-    public function postSchemaChange(IOutput $output, \Closure $schemaClosure, array $options): void {}
+    public function postSchemaChange(IOutput $output, \Closure $schemaClosure, array $options): void
+    {
+        // Revert doctrine patch
+        \Doctrine\DBAL\Types\Type::overrideType(Types::FLOAT, \Doctrine\DBAL\Types\FloatType::class);
+    }
+}
+
+class RealFloatType extends \Doctrine\DBAL\Types\FloatType
+{
+    public function getSQLDeclaration(array $column, \Doctrine\DBAL\Platforms\AbstractPlatform $platform)
+    {
+        if (preg_match('/mysql|mariadb/i', $platform::class)) {
+            return 'FLOAT';
+        }
+
+        // https://www.postgresql.org/docs/current/datatype-numeric.html
+        if (preg_match('/postgres/i', $platform::class)) {
+            return 'REAL';
+        }
+
+        return parent::getSQLDeclaration($column, $platform);
+    }
 }
diff --git a/lib/Migration/Version800000Date20240327192949.php b/lib/Migration/Version900000Date20240327192949.php
similarity index 92%
rename from lib/Migration/Version800000Date20240327192949.php
rename to lib/Migration/Version900000Date20240327192949.php
index 20cf6a105..5fba29a7d 100644
--- a/lib/Migration/Version800000Date20240327192949.php
+++ b/lib/Migration/Version900000Date20240327192949.php
@@ -28,7 +28,7 @@
 use OCP\Migration\IOutput;
 use OCP\Migration\SimpleMigrationStep;
 
-class Version800000Date20240327192949 extends SimpleMigrationStep
+class Version900000Date20240327192949 extends SimpleMigrationStep
 {
     /**
      * @param \Closure(): ISchemaWrapper $schemaClosure
@@ -61,6 +61,10 @@ public function changeSchema(IOutput $output, \Closure $schemaClosure, array $op
                 'notnull' => true,
                 'default' => 0,
             ]);
+            $table->addColumn('word', Types::STRING, [
+                'notnull' => false,
+                'length' => 64,
+            ]);
 
             $table->setPrimaryKey(['id']);
             $table->addIndex(['fileid'], 'memories_ss_cls_fileid');