diff --git a/composer.lock b/composer.lock
index 331792f7..422c53d6 100644
--- a/composer.lock
+++ b/composer.lock
@@ -557,16 +557,16 @@
         },
         {
             "name": "symfony/finder",
-            "version": "v6.4.0",
+            "version": "v6.4.7",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/finder.git",
-                "reference": "11d736e97f116ac375a81f96e662911a34cd50ce"
+                "reference": "511c48990be17358c23bf45c5d71ab85d40fb764"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/finder/zipball/11d736e97f116ac375a81f96e662911a34cd50ce",
-                "reference": "11d736e97f116ac375a81f96e662911a34cd50ce",
+                "url": "https://api.github.com/repos/symfony/finder/zipball/511c48990be17358c23bf45c5d71ab85d40fb764",
+                "reference": "511c48990be17358c23bf45c5d71ab85d40fb764",
                 "shasum": ""
             },
             "require": {
@@ -601,7 +601,7 @@
             "description": "Finds files and directories via an intuitive fluent interface",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/finder/tree/v6.4.0"
+                "source": "https://github.com/symfony/finder/tree/v6.4.7"
             },
             "funding": [
                 {
@@ -617,20 +617,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-10-31T17:30:12+00:00"
+            "time": "2024-04-23T10:36:43+00:00"
         },
         {
             "name": "symfony/polyfill-ctype",
-            "version": "v1.28.0",
+            "version": "v1.29.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-ctype.git",
-                "reference": "ea208ce43cbb04af6867b4fdddb1bdbf84cc28cb"
+                "reference": "ef4d7e442ca910c4764bce785146269b30cb5fc4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/ea208ce43cbb04af6867b4fdddb1bdbf84cc28cb",
-                "reference": "ea208ce43cbb04af6867b4fdddb1bdbf84cc28cb",
+                "url": "https://api.github.com/repos/symfony/polyfill-ctype/zipball/ef4d7e442ca910c4764bce785146269b30cb5fc4",
+                "reference": "ef4d7e442ca910c4764bce785146269b30cb5fc4",
                 "shasum": ""
             },
             "require": {
@@ -644,9 +644,6 @@
             },
             "type": "library",
             "extra": {
-                "branch-alias": {
-                    "dev-main": "1.28-dev"
-                },
                 "thanks": {
                     "name": "symfony/polyfill",
                     "url": "https://github.com/symfony/polyfill"
@@ -683,7 +680,7 @@
                 "portable"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-ctype/tree/v1.28.0"
+                "source": "https://github.com/symfony/polyfill-ctype/tree/v1.29.0"
             },
             "funding": [
                 {
@@ -699,20 +696,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-01-26T09:26:14+00:00"
+            "time": "2024-01-29T20:11:03+00:00"
         },
         {
             "name": "symfony/polyfill-mbstring",
-            "version": "v1.28.0",
+            "version": "v1.29.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "42292d99c55abe617799667f454222c54c60e229"
+                "reference": "9773676c8a1bb1f8d4340a62efe641cf76eda7ec"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/42292d99c55abe617799667f454222c54c60e229",
-                "reference": "42292d99c55abe617799667f454222c54c60e229",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/9773676c8a1bb1f8d4340a62efe641cf76eda7ec",
+                "reference": "9773676c8a1bb1f8d4340a62efe641cf76eda7ec",
                 "shasum": ""
             },
             "require": {
@@ -726,9 +723,6 @@
             },
             "type": "library",
             "extra": {
-                "branch-alias": {
-                    "dev-main": "1.28-dev"
-                },
                 "thanks": {
                     "name": "symfony/polyfill",
                     "url": "https://github.com/symfony/polyfill"
@@ -766,7 +760,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.28.0"
+                "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.29.0"
             },
             "funding": [
                 {
@@ -782,20 +776,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-07-28T09:04:16+00:00"
+            "time": "2024-01-29T20:11:03+00:00"
         },
         {
             "name": "symfony/polyfill-php80",
-            "version": "v1.28.0",
+            "version": "v1.29.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-php80.git",
-                "reference": "6caa57379c4aec19c0a12a38b59b26487dcfe4b5"
+                "reference": "87b68208d5c1188808dd7839ee1e6c8ec3b02f1b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php80/zipball/6caa57379c4aec19c0a12a38b59b26487dcfe4b5",
-                "reference": "6caa57379c4aec19c0a12a38b59b26487dcfe4b5",
+                "url": "https://api.github.com/repos/symfony/polyfill-php80/zipball/87b68208d5c1188808dd7839ee1e6c8ec3b02f1b",
+                "reference": "87b68208d5c1188808dd7839ee1e6c8ec3b02f1b",
                 "shasum": ""
             },
             "require": {
@@ -803,9 +797,6 @@
             },
             "type": "library",
             "extra": {
-                "branch-alias": {
-                    "dev-main": "1.28-dev"
-                },
                 "thanks": {
                     "name": "symfony/polyfill",
                     "url": "https://github.com/symfony/polyfill"
@@ -849,7 +840,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-php80/tree/v1.28.0"
+                "source": "https://github.com/symfony/polyfill-php80/tree/v1.29.0"
             },
             "funding": [
                 {
@@ -865,20 +856,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-01-26T09:26:14+00:00"
+            "time": "2024-01-29T20:11:03+00:00"
         },
         {
             "name": "symfony/polyfill-php81",
-            "version": "v1.28.0",
+            "version": "v1.29.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-php81.git",
-                "reference": "7581cd600fa9fd681b797d00b02f068e2f13263b"
+                "reference": "c565ad1e63f30e7477fc40738343c62b40bc672d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-php81/zipball/7581cd600fa9fd681b797d00b02f068e2f13263b",
-                "reference": "7581cd600fa9fd681b797d00b02f068e2f13263b",
+                "url": "https://api.github.com/repos/symfony/polyfill-php81/zipball/c565ad1e63f30e7477fc40738343c62b40bc672d",
+                "reference": "c565ad1e63f30e7477fc40738343c62b40bc672d",
                 "shasum": ""
             },
             "require": {
@@ -886,9 +877,6 @@
             },
             "type": "library",
             "extra": {
-                "branch-alias": {
-                    "dev-main": "1.28-dev"
-                },
                 "thanks": {
                     "name": "symfony/polyfill",
                     "url": "https://github.com/symfony/polyfill"
@@ -928,7 +916,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-php81/tree/v1.28.0"
+                "source": "https://github.com/symfony/polyfill-php81/tree/v1.29.0"
             },
             "funding": [
                 {
@@ -944,20 +932,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-01-26T09:26:14+00:00"
+            "time": "2024-01-29T20:11:03+00:00"
         },
         {
             "name": "symfony/process",
-            "version": "v6.4.2",
+            "version": "v6.4.7",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
-                "reference": "c4b1ef0bc80533d87a2e969806172f1c2a980241"
+                "reference": "cdb1c81c145fd5aa9b0038bab694035020943381"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/process/zipball/c4b1ef0bc80533d87a2e969806172f1c2a980241",
-                "reference": "c4b1ef0bc80533d87a2e969806172f1c2a980241",
+                "url": "https://api.github.com/repos/symfony/process/zipball/cdb1c81c145fd5aa9b0038bab694035020943381",
+                "reference": "cdb1c81c145fd5aa9b0038bab694035020943381",
                 "shasum": ""
             },
             "require": {
@@ -989,7 +977,7 @@
             "description": "Executes commands in sub-processes",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/process/tree/v6.4.2"
+                "source": "https://github.com/symfony/process/tree/v6.4.7"
             },
             "funding": [
                 {
@@ -1005,7 +993,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-12-22T16:42:54+00:00"
+            "time": "2024-04-18T09:22:46+00:00"
         },
         {
             "name": "thecodingmachine/safe",
@@ -1150,16 +1138,16 @@
     "packages-dev": [
         {
             "name": "phpstan/phpstan",
-            "version": "1.10.56",
+            "version": "1.10.67",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "27816a01aea996191ee14d010f325434c0ee76fa"
+                "reference": "16ddbe776f10da6a95ebd25de7c1dbed397dc493"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/27816a01aea996191ee14d010f325434c0ee76fa",
-                "reference": "27816a01aea996191ee14d010f325434c0ee76fa",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/16ddbe776f10da6a95ebd25de7c1dbed397dc493",
+                "reference": "16ddbe776f10da6a95ebd25de7c1dbed397dc493",
                 "shasum": ""
             },
             "require": {
@@ -1202,13 +1190,9 @@
                 {
                     "url": "https://github.com/phpstan",
                     "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/phpstan/phpstan",
-                    "type": "tidelift"
                 }
             ],
-            "time": "2024-01-15T10:43:00+00:00"
+            "time": "2024-04-16T07:22:02+00:00"
         },
         {
             "name": "thecodingmachine/phpstan-safe-rule",
diff --git a/config/phpstan/phpstan.neon b/config/phpstan/phpstan.neon
index 50227612..f2612e52 100644
--- a/config/phpstan/phpstan.neon
+++ b/config/phpstan/phpstan.neon
@@ -30,3 +30,14 @@ parameters:
 			- Emit404
 			- Emit403
 			- RedirectToLogin
+	exceptions:
+		check:
+			missingCheckedExceptionInThrows: true
+			tooWideThrowType: true
+		uncheckedExceptionRegexes:
+			-'#^Safe\\#'
+		uncheckedExceptionClasses:
+			- 'Exceptions\DatabaseQueryException'
+			- 'PDOException'
+			- 'TypeError'
+			- 'ValueError'
diff --git a/config/sql/se/PollVotes.sql b/config/sql/se/PollVotes.sql
index 1686d131..fd2229ad 100644
--- a/config/sql/se/PollVotes.sql
+++ b/config/sql/se/PollVotes.sql
@@ -1,6 +1,6 @@
 CREATE TABLE `PollVotes` (
   `UserId` int(10) unsigned NOT NULL,
   `PollItemId` int(10) unsigned NOT NULL,
-  `Created` datetime NOT NULL,
+  `Created` timestamp NOT NULL DEFAULT current_timestamp() ON UPDATE current_timestamp(),
   UNIQUE KEY `idxUnique` (`PollItemId`,`UserId`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
diff --git a/lib/Artist.php b/lib/Artist.php
index 93fadcf6..904f73f1 100644
--- a/lib/Artist.php
+++ b/lib/Artist.php
@@ -89,6 +89,7 @@ class Artist{
 	 * @throws Exceptions\InvalidArtistException
 	 */
 	public function Validate(): void{
+		/** @throws void */
 		$now = new DateTimeImmutable();
 		$thisYear = intval($now->format('Y'));
 
@@ -136,6 +137,9 @@ class Artist{
 		return $result[0] ?? throw new Exceptions\ArtistNotFoundException();;
 	}
 
+	/**
+	 * @throws Exceptions\InvalidArtistException
+	 */
 	public function Create(): void{
 		$this->Validate();
 		Db::Query('
@@ -149,7 +153,7 @@ class Artist{
 	}
 
 	/**
-	 * @throws Exceptions\ValidationException
+	 * @throws Exceptions\InvalidArtistException
 	 */
 	public static function GetOrCreate(Artist $artist): Artist{
 		$result = Db::Query('
diff --git a/lib/Artwork.php b/lib/Artwork.php
index 07482984..af45573f 100644
--- a/lib/Artwork.php
+++ b/lib/Artwork.php
@@ -1,5 +1,13 @@
 <?
+
+use Exceptions\InvalidImageUploadException;
+use Exceptions\InvalidPageScanUrlException;
+use Exceptions\InvalidUrlException;
 use Safe\DateTimeImmutable;
+use Safe\Exceptions\ExecException;
+use Safe\Exceptions\FilesystemException;
+use Safe\Exceptions\PcreException;
+
 use function Safe\copy;
 use function Safe\exec;
 use function Safe\getimagesize;
@@ -160,6 +168,9 @@ class Artwork{
 		return $this->_Tags;
 	}
 
+	/**
+	 * @throws Exceptions\InvalidUrlException
+	 */
 	public function GetMuseum(): ?Museum{
 		if($this->_Museum === null){
 			try{
@@ -252,6 +263,9 @@ class Artwork{
 		return $this->_Dimensions;
 	}
 
+	/**
+	 * @throws Exceptions\AppException
+	 */
 	protected function GetEbook(): ?Ebook{
 		if($this->_Ebook === null){
 			if($this->EbookUrl === null){
@@ -318,9 +332,10 @@ class Artwork{
 	}
 
 	/**
-	 * @throws Exceptions\ValidationException
+	 * @throws Exceptions\InvalidArtworkException
 	 */
 	protected function Validate(?string $imagePath = null, bool $isImageRequired = true): void{
+		/** @throws void */
 		$now = new DateTimeImmutable();
 		$thisYear = intval($now->format('Y'));
 		$error = new Exceptions\InvalidArtworkException();
@@ -509,6 +524,10 @@ class Artwork{
 		}
 	}
 
+	/**
+	 * @throws Exceptions\InvalidUrlException
+	 * @throws Exceptions\InvalidPageScanUrlException
+	 */
 	public static function NormalizePageScanUrl(string $url): string{
 		$outputUrl = $url;
 
@@ -621,6 +640,9 @@ class Artwork{
 		return $outputUrl;
 	}
 
+	/**
+	 * @throws Exceptions\InvalidImageUploadException
+	 */
 	private function WriteImageAndThumbnails(string $imagePath): void{
 		exec('exiftool -quiet -overwrite_original -all= ' . escapeshellarg($imagePath));
 		copy($imagePath, $this->ImageFsPath);
@@ -645,6 +667,7 @@ class Artwork{
 
 		$this->Validate($imagePath, true);
 
+		/** @throws void */
 		$this->Created = new DateTimeImmutable();
 
 		$tags = [];
@@ -700,7 +723,10 @@ class Artwork{
 	}
 
 	/**
-	 * @throws Exceptions\ValidationException
+	 * @throws Exceptions\InvalidArtworkException
+	 * @throws Exceptions\InvalidArtistException
+	 * @throws Exceptions\InvalidArtworkTagException
+	 * @throws Exceptions\InvalidImageUploadException
 	 */
 	public function Save(?string $imagePath = null): void{
 		$this->_UrlName = null;
@@ -710,6 +736,7 @@ class Artwork{
 
 			// Manually set the updated timestamp, because if we only update the image and nothing else, the row's
 			// updated timestamp won't change automatically.
+			/** @throws void */
 			$this->Updated = new DateTimeImmutable();
 			$this->_ImageUrl = null;
 			$this->_ThumbUrl = null;
diff --git a/lib/ArtworkTag.php b/lib/ArtworkTag.php
index b74cdffd..cfef1db0 100644
--- a/lib/ArtworkTag.php
+++ b/lib/ArtworkTag.php
@@ -1,4 +1,7 @@
 <?
+
+use Exceptions\InvalidArtworkTagException;
+
 use function Safe\preg_match;
 use function Safe\preg_replace;
 
@@ -20,7 +23,7 @@ class ArtworkTag extends Tag{
 	// *******
 
 	/**
-	 * @throws Exceptions\ValidationException
+	 * @throws Exceptions\InvalidArtworkTagException
 	 */
 	public function Validate(): void{
 		$error = new Exceptions\InvalidArtworkTagException($this->Name);
@@ -46,6 +49,9 @@ class ArtworkTag extends Tag{
 		}
 	}
 
+	/**
+	 * @throws InvalidArtworkTagException
+	 */
 	public function Create(): void{
 		$this->Validate();
 
@@ -57,7 +63,7 @@ class ArtworkTag extends Tag{
 	}
 
 	/**
-	 * @throws Exceptions\ValidationException
+	 * @throws Exceptions\InvalidArtworkTagException
 	 */
 	public static function GetOrCreate(ArtworkTag $artworkTag): ArtworkTag{
 		$result = Db::Query('
diff --git a/lib/AtomFeed.php b/lib/AtomFeed.php
index d6b73fcb..52ba67f6 100644
--- a/lib/AtomFeed.php
+++ b/lib/AtomFeed.php
@@ -39,6 +39,7 @@ class AtomFeed extends Feed{
 		// Did we actually update the feed? If so, write to file and update the index
 		if($this->HasChanged($this->Path)){
 			// Files don't match, save the file
+			/** @throws void */
 			$this->Updated = new DateTimeImmutable();
 			$this->Save();
 			return true;
diff --git a/lib/DbConnection.php b/lib/DbConnection.php
index cfefe638..49f95c2b 100644
--- a/lib/DbConnection.php
+++ b/lib/DbConnection.php
@@ -188,6 +188,7 @@ class DbConnection{
 							switch($metadata[$i]['native_type'] ?? null){
 								case 'DATETIME':
 								case 'TIMESTAMP':
+									/** @throws void */
 									$object->{$metadata[$i]['name']} = new DateTimeImmutable($row[$i], new DateTimeZone('UTC'));
 									break;
 
diff --git a/lib/Ebook.php b/lib/Ebook.php
index 6b185d11..3adf0b22 100644
--- a/lib/Ebook.php
+++ b/lib/Ebook.php
@@ -1,5 +1,7 @@
 <?
+
 use Safe\DateTimeImmutable;
+
 use function Safe\file_get_contents;
 use function Safe\filesize;
 use function Safe\json_encode;
@@ -75,6 +77,11 @@ class Ebook{
 	public ?string $TextSinglePageSizeUnit = null;
 	public $TocEntries = null; // A list of non-Roman ToC entries ONLY IF the work has the 'se:is-a-collection' metadata element, null otherwise
 
+	/**
+	 * @throws Exceptions\EbookNotFoundException
+	 * @throws Exceptions\EbookParsingException
+	 * @throws Exceptions\InvalidGitCommitException
+	 */
 	public function __construct(?string $wwwFilesystemPath = null){
 		if($wwwFilesystemPath === null){
 			return;
@@ -88,7 +95,7 @@ class Ebook{
 			try{
 				$this->RepoFilesystemPath = preg_replace('/\.git$/ius', '', $this->RepoFilesystemPath);
 			}
-			catch(Exception){
+			catch(\Exception){
 				// We may get an exception from preg_replace if the passed repo wwwFilesystemPath contains invalid UTF-8 characters, whichis  a common injection attack vector
 				throw new Exceptions\EbookNotFoundException('Invalid repo filesystem path: ' . $this->RepoFilesystemPath);
 			}
@@ -128,11 +135,16 @@ class Ebook{
 			$bytes = @filesize($this->WwwFilesystemPath . '/text/single-page.xhtml');
 			$sizes = 'BKMGTP';
 			$factor = intval(floor((strlen((string)$bytes) - 1) / 3));
-			$this->TextSinglePageSizeNumber = sprintf('%.1f', $bytes / pow(1024, $factor));
+			try{
+				$this->TextSinglePageSizeNumber = sprintf('%.1f', $bytes / pow(1024, $factor));
+			}
+			catch(\DivisionByZeroError){
+				$this->TextSinglePageSizeNumber = '0';
+			}
 			$this->TextSinglePageSizeUnit = $sizes[$factor] ?? '';
 			$this->TextSinglePageUrl = $this->Url . '/text/single-page';
 		}
-		catch(Exception){
+		catch(\Exception){
 			// Single page file doesn't exist, just pass
 		}
 
@@ -206,7 +218,13 @@ class Ebook{
 		}
 
 		// Now do some heavy XML lifting!
-		$xml = new SimpleXMLElement(str_replace('xmlns=', 'ns=', $rawMetadata));
+		try{
+			$xml = new SimpleXMLElement(str_replace('xmlns=', 'ns=', $rawMetadata));
+		}
+		catch(\Exception $ex){
+			throw new Exceptions\EbookParsingException($ex->getMessage());
+		}
+
 		$xml->registerXPathNamespace('dc', 'http://purl.org/dc/elements/1.1/');
 
 		$this->Title = $this->NullIfEmpty($xml->xpath('/package/metadata/dc:title'));
@@ -222,11 +240,13 @@ class Ebook{
 
 		$date = $xml->xpath('/package/metadata/dc:date') ?: [];
 		if($date !== false && sizeof($date) > 0){
+			/** @throws void */
 			$this->Created = new DateTimeImmutable((string)$date[0]);
 		}
 
 		$modifiedDate = $xml->xpath('/package/metadata/meta[@property="dcterms:modified"]') ?: [];
 		if($modifiedDate !== false && sizeof($modifiedDate) > 0){
+			/** @throws void */
 			$this->Updated = new DateTimeImmutable((string)$modifiedDate[0]);
 		}
 
@@ -240,7 +260,12 @@ class Ebook{
 		// Fill the ToC if necessary
 		if($includeToc){
 			$this->TocEntries = [];
-			$tocDom = new SimpleXMLElement(str_replace('xmlns=', 'ns=', file_get_contents($wwwFilesystemPath . '/toc.xhtml')));
+			try{
+				$tocDom = new SimpleXMLElement(str_replace('xmlns=', 'ns=', file_get_contents($wwwFilesystemPath . '/toc.xhtml')));
+			}
+			catch(\Exception $ex){
+				throw new Exceptions\EbookParsingException($ex->getMessage());
+			}
 			$tocDom->registerXPathNamespace('epub', 'http://www.idpf.org/2007/ops');
 			foreach($tocDom->xpath('/html/body//nav[@epub:type="toc"]//a[not(contains(@epub:type, "z3998:roman")) and not(text() = "Titlepage" or text() = "Imprint" or text() = "Colophon" or text() = "Endnotes" or text() = "Uncopyright") and not(contains(@href, "halftitle"))]') ?: [] as $item){
 				$this->TocEntries[] = (string)$item;
diff --git a/lib/Exceptions/InvalidGitCommitException.php b/lib/Exceptions/InvalidGitCommitException.php
new file mode 100644
index 00000000..425dfee3
--- /dev/null
+++ b/lib/Exceptions/InvalidGitCommitException.php
@@ -0,0 +1,5 @@
+<?
+namespace Exceptions;
+
+class InvalidGitCommitException extends AppException{
+}
diff --git a/lib/GitCommit.php b/lib/GitCommit.php
index 15fea568..a73ce786 100644
--- a/lib/GitCommit.php
+++ b/lib/GitCommit.php
@@ -6,8 +6,16 @@ class GitCommit{
 	public string $Message;
 	public string $Hash;
 
+	/**
+	 * @throws Exceptions\InvalidGitCommitException
+	 */
 	public function __construct(string $unixTimestamp, string $hash, string $message){
-		$this->Created = new DateTimeImmutable('@' . $unixTimestamp);
+		try{
+			$this->Created = new DateTimeImmutable('@' . $unixTimestamp);
+		}
+		catch(\Exception){
+			throw new Exceptions\InvalidGitCommitException('Invalid timestamp for Git commit.');
+		}
 		$this->Message = $message;
 		$this->Hash = $hash;
 	}
diff --git a/lib/Image.php b/lib/Image.php
index 1c2f806b..fee13f0c 100644
--- a/lib/Image.php
+++ b/lib/Image.php
@@ -1,4 +1,8 @@
 <?
+
+use Safe\Exceptions\ImageException;
+use Exceptions\InvalidImageUploadException;
+
 use function Safe\exec;
 use function Safe\imagecopyresampled;
 use function Safe\imagecreatetruecolor;
@@ -69,19 +73,37 @@ class Image{
 		return $handle;
 	}
 
+	/**
+	 * @throws Exceptions\InvalidImageUploadException
+	 */
 	public function Resize(string $destImagePath, int $width, int $height): void{
-		$imageDimensions = getimagesize($this->Path);
+		try{
+			$imageDimensions = getimagesize($this->Path);
+		}
+		catch(\Safe\Exceptions\ImageException $ex){
+			throw new Exceptions\InvalidImageUploadException($ex->getMessage());
+		}
 
 		$imageWidth = $imageDimensions[0];
 		$imageHeight = $imageDimensions[1];
 
 		if($imageHeight > $imageWidth){
 			$destinationHeight = $height;
-			$destinationWidth = intval($destinationHeight * ($imageWidth / $imageHeight));
+			try{
+				$destinationWidth = intval($destinationHeight * ($imageWidth / $imageHeight));
+			}
+			catch(\DivisionByZeroError){
+				$destinationWidth = 0;
+			}
 		}
 		else{
 			$destinationWidth = $width;
-			$destinationHeight = intval($destinationWidth * ($imageHeight / $imageWidth));
+			try{
+				$destinationHeight = intval($destinationWidth * ($imageHeight / $imageWidth));
+			}
+			catch(\DivisionByZeroError){
+				$destinationHeight = 0;
+			}
 		}
 
 		$srcImageHandle = $this->GetImageHandle();
diff --git a/lib/Library.php b/lib/Library.php
index 2b9f9cd7..d09ac04a 100644
--- a/lib/Library.php
+++ b/lib/Library.php
@@ -1,5 +1,15 @@
 <?
+
+use Exceptions\AppException;
+use Exceptions\ArtistNotFoundException;
 use Safe\DateTimeImmutable;
+use Safe\Exceptions\ExecException;
+use Safe\Exceptions\PcreException;
+use Safe\Exceptions\FilesystemException;
+use Safe\Exceptions\DatetimeException;
+use Safe\Exceptions\ArrayException;
+use Safe\Exceptions\MiscException;
+
 use function Safe\apcu_fetch;
 use function Safe\exec;
 use function Safe\filemtime;
@@ -18,6 +28,7 @@ class Library{
 	* @param array<string> $tags
 	* @param EbookSort $sort
 	* @return array<Ebook>
+	* @throws Exceptions\AppException
 	*/
 	public static function FilterEbooks(string $query = null, array $tags = [], EbookSort $sort = null){
 		$ebooks = Library::GetEbooks();
@@ -109,6 +120,7 @@ class Library{
 
 	/**
 	 * @return array<Ebook>
+	 * @throws Exceptions\AppException
 	 */
 	public static function GetEbooks(): array{
 		// Get all ebooks, unsorted.
@@ -117,6 +129,7 @@ class Library{
 
 	/**
 	 * @return array<Ebook>
+	 * @throws Exceptions\AppException
 	 */
 	public static function GetEbooksByAuthor(string $wwwFilesystemPath): array{
 		return self::GetFromApcu('author-' . $wwwFilesystemPath);
@@ -136,6 +149,7 @@ class Library{
 
 	/**
 	 * @return array<string, Collection>
+	 * @throws Exceptions\AppException
 	 */
 	public static function GetEbookCollections(): array{
 		return self::GetFromApcu('collections');
@@ -143,6 +157,7 @@ class Library{
 
 	/**
 	 * @return array<Ebook>
+	 * @throws Exceptions\AppException
 	 */
 	public static function GetEbooksByCollection(string $collection): array{
 		// Do we have the tag's ebooks cached?
@@ -151,6 +166,7 @@ class Library{
 
 	/**
 	 * @return array<Tag>
+	 * @throws Exceptions\AppException
 	 */
 	public static function GetTags(): array{
 		return self::GetFromApcu('tags');
@@ -303,8 +319,10 @@ class Library{
 		return ['artworks' => $artworks, 'artworksCount' => $artworksCount];
 	}
 
+
 	/**
- 	 * @return array<Artwork>
+	 * @return array<Artwork>
+	 * @throws Exceptions\ArtistNotFoundException
 	 */
 	public static function GetArtworksByArtist(?string $artistUrlName, ?string $status, ?int $submitterUserId): array{
 		if($artistUrlName === null){
@@ -346,8 +364,10 @@ class Library{
 		return $artworks;
 	}
 
+
 	/**
 	 * @return array<mixed>
+	 * @throws Exceptions\AppException
 	 */
 	private static function GetFromApcu(string $variable): array{
 		$results = [];
@@ -389,6 +409,7 @@ class Library{
 
 	/**
 	 * @return array<Ebook>
+	 * @throws Exceptions\AppException
 	 */
 	public static function Search(string $query): array{
 		$ebooks = Library::GetEbooks();
@@ -432,6 +453,8 @@ class Library{
 
 	private static function FillBulkDownloadObject(string $dir, string $downloadType, string $urlRoot): stdClass{
 		$obj = new stdClass();
+
+		/** @throws void */
 		$now = new DateTimeImmutable();
 
 		// The count of ebooks in each file is stored as a filesystem attribute
@@ -479,6 +502,7 @@ class Library{
 			$obj->ZipFiles[] = $zipFile;
 		}
 
+		/** @throws void */
 		$obj->Updated = new DateTimeImmutable('@' . filemtime($files[0]));
 		$obj->UpdatedString = $obj->Updated->format('M j');
 		// Add a period to the abbreviated month, but not if it's May (the only 3-letter month)
@@ -526,6 +550,7 @@ class Library{
 
 	/**
 	 * @return array<string, array<int|string, array<int|string, mixed>>>
+	 * @throws Exceptions\AppException
 	 */
 	public static function RebuildBulkDownloadsCache(): array{
 		$collator = Collator::create('en_US'); // Used for sorting letters with diacritics like in author names
@@ -546,7 +571,12 @@ class Library{
 		foreach($dirs as $dir){
 			$obj = self::FillBulkDownloadObject($dir, 'months', '/months');
 
-			$date = new DateTimeImmutable($obj->Label . '-01');
+			try{
+				$date = new DateTimeImmutable($obj->Label . '-01');
+			}
+			catch(\Exception){
+				throw new Exceptions\AppException('Couldn\'t parse date on bulk download object.');
+			}
 			$year = $date->format('Y');
 			$month = $date->format('F');
 
@@ -588,6 +618,7 @@ class Library{
 
 	/**
 	 * @return array<string, array<int|string, array<int|string, mixed>>>
+	 * @throws Exceptions\AppException
 	 */
 	public static function RebuildFeedsCache(?string $returnType = null, ?string $returnClass = null): ?array{
 		$feedTypes = ['opds', 'atom', 'rss'];
@@ -634,6 +665,9 @@ class Library{
 		return $retval;
 	}
 
+	/**
+	 * @throws Exceptions\AppException
+	 */
 	public static function GetEbook(?string $ebookWwwFilesystemPath): ?Ebook{
 		if($ebookWwwFilesystemPath === null){
 			return null;
@@ -649,6 +683,9 @@ class Library{
 		}
 	}
 
+	/**
+	 * @throws Exceptions\AppException
+	 */
 	public static function RebuildCache(): void{
 		// We check a lockfile because this can be a long-running command.
 		// We don't want to queue up a bunch of these in case someone is refreshing the index constantly.
diff --git a/lib/Log.php b/lib/Log.php
index ad55a2c9..201dcda4 100644
--- a/lib/Log.php
+++ b/lib/Log.php
@@ -33,6 +33,7 @@ class Log{
 				return;
 			}
 
+			/** @throws void */
 			$now = new DateTimeImmutable();
 
 			fwrite($fp, $now->format('Y-m-d H:i:s') . "\t" . $this->RequestId . "\t" . $text . "\n");
diff --git a/lib/Museum.php b/lib/Museum.php
index a1ae8edb..8dbb5902 100644
--- a/lib/Museum.php
+++ b/lib/Museum.php
@@ -1,4 +1,10 @@
 <?
+
+use Exceptions\InvalidUrlException;
+use Safe\Exceptions\PcreException;
+use Exceptions\InvalidMuseumUrlException;
+use Exceptions\InvalidPageScanUrlException;
+
 use function Safe\parse_url;
 use function Safe\preg_match;
 use function Safe\preg_replace;
@@ -10,6 +16,11 @@ class Museum{
 	public string $Name;
 	public string $Domain;
 
+	/**
+	 * @throws Exceptions\InvalidUrlException
+	 * @throws Exceptions\InvalidMuseumUrlException
+	 * @throws Exceptions\InvalidPageScanUrlException
+	 */
 	public static function NormalizeUrl(string $url): string{
 		$outputUrl = $url;
 
diff --git a/lib/NewsletterSubscription.php b/lib/NewsletterSubscription.php
index 37fb33bd..5ec73947 100644
--- a/lib/NewsletterSubscription.php
+++ b/lib/NewsletterSubscription.php
@@ -1,5 +1,9 @@
 <?
+
+use Exceptions\InvalidNewsletterSubscription;
+use Exceptions\NewsletterSubscriptionExistsException;
 use Safe\DateTimeImmutable;
+use Safe\Exceptions\ErrorfuncException;
 
 /**
  * @property User $User
@@ -33,6 +37,10 @@ class NewsletterSubscription{
 	// METHODS
 	// *******
 
+	/**
+	 * @throws Exceptions\InvalidNewsletterSubscription
+	 * @throws Exceptions\NewsletterSubscriptionExistsException
+	 */
 	public function Create(?string $expectedCaptcha = null, ?string $receivedCaptcha = null): void{
 		$this->Validate($expectedCaptcha, $receivedCaptcha);
 
@@ -42,10 +50,18 @@ class NewsletterSubscription{
 		}
 		catch(Exceptions\UserNotFoundException){
 			// User doesn't exist, create the user
-			$this->User->Create();
+
+			try{
+				$this->User->Create();
+			}
+			catch(Exceptions\UserExistsException){
+				// User exists, pass
+			}
 		}
 
 		$this->UserId = $this->User->UserId;
+
+		/** @throws void */
 		$this->Created = new DateTimeImmutable();
 
 		try{
@@ -66,6 +82,9 @@ class NewsletterSubscription{
 		$this->SendConfirmationEmail();
 	}
 
+	/**
+	 * @throws Exceptions\InvalidNewsletterSubscription
+	 */
 	public function Save(): void{
 		$this->Validate();
 
@@ -107,6 +126,10 @@ class NewsletterSubscription{
 		', [$this->UserId]);
 	}
 
+
+	/**
+	 * @throws Exceptions\InvalidNewsletterSubscription
+	 */
 	public function Validate(?string $expectedCaptcha = null, ?string $receivedCaptcha = null): void{
 		$error = new Exceptions\InvalidNewsletterSubscription();
 
diff --git a/lib/OpdsFeed.php b/lib/OpdsFeed.php
index f4d5ba8c..00dda257 100644
--- a/lib/OpdsFeed.php
+++ b/lib/OpdsFeed.php
@@ -50,6 +50,7 @@ class OpdsFeed extends AtomFeed{
 		if($this->HasChanged($this->Path)){
 			// Files don't match, save the file and update the parent navigation feed with the last updated timestamp
 
+			/** @throws void */
 			$this->Updated = new DateTimeImmutable();
 
 			if($this->Parent !== null){
diff --git a/lib/Patron.php b/lib/Patron.php
index 92c4f391..81501089 100644
--- a/lib/Patron.php
+++ b/lib/Patron.php
@@ -21,6 +21,7 @@ class Patron{
 	// *******
 
 	public function Create(): void{
+		/** @throws void */
 		$this->Created = new DateTimeImmutable();
 		Db::Query('
 			INSERT into Patrons (Created, UserId, IsAnonymous, AlternateName, IsSubscribedToEmails)
diff --git a/lib/Payment.php b/lib/Payment.php
index bf518714..e8ac4e81 100644
--- a/lib/Payment.php
+++ b/lib/Payment.php
@@ -1,4 +1,7 @@
 <?
+
+use Exceptions\UserExistsException;
+use Exceptions\PaymentExistsException;
 use Safe\DateTimeImmutable;
 
 /**
@@ -23,6 +26,9 @@ class Payment{
 	// METHODS
 	// *******
 
+	/**
+	 * @throws Exceptions\PaymentExistsException
+	 */
 	public function Create(): void{
 		if($this->UserId === null){
 			// Check if we have to create a new user in the database
@@ -45,7 +51,13 @@ class Payment{
 				}
 				catch(Exceptions\UserNotFoundException){
 					// User doesn't exist, create it now
-					$this->User->Create();
+
+					try{
+						$this->User->Create();
+					}
+					catch(Exceptions\UserExistsException){
+						// User already exists, pass
+					}
 				}
 
 				$this->UserId = $this->User->UserId;
diff --git a/lib/Poll.php b/lib/Poll.php
index 47c97db5..de4c8bc4 100644
--- a/lib/Poll.php
+++ b/lib/Poll.php
@@ -87,6 +87,7 @@ class Poll{
 	// *******
 
 	public function IsActive(): bool{
+		/** @throws void */
 		$now = new DateTimeImmutable();
 		if( ($this->Start !== null && $this->Start > $now) || ($this->End !== null && $this->End < $now)){
 			return false;
diff --git a/lib/PollItem.php b/lib/PollItem.php
index b0abb723..206906b5 100644
--- a/lib/PollItem.php
+++ b/lib/PollItem.php
@@ -1,4 +1,7 @@
 <?
+
+use Exceptions\PollItemNotFoundException;
+
 /**
  * @property int $VoteCount
  * @property Poll $Poll
@@ -37,7 +40,7 @@ class PollItem{
 	// ***********
 
 	/**
-	 * @throws Exceptions\PollNotFoundException
+	 * @throws Exceptions\PollItemNotFoundException
 	 */
 	public static function Get(?int $pollItemId): PollItem{
 		if($pollItemId === null ){
diff --git a/lib/PollVote.php b/lib/PollVote.php
index 199b9d3b..2dbf3fe1 100644
--- a/lib/PollVote.php
+++ b/lib/PollVote.php
@@ -1,4 +1,6 @@
 <?
+
+use Exceptions\InvalidPollVoteException;
 use Safe\DateTimeImmutable;
 
 /**
@@ -86,6 +88,9 @@ class PollVote{
 		}
 	}
 
+	/**
+	 * @throws Exceptions\InvalidPollVoteException
+	 */
 	public function Create(?string $email = null): void{
 		if($email !== null){
 			try{
@@ -103,13 +108,11 @@ class PollVote{
 		}
 
 		$this->Validate();
-		$this->Created = new DateTimeImmutable();
 		Db::Query('
-			INSERT into PollVotes (UserId, PollItemId, Created)
+			INSERT into PollVotes (UserId, PollItemId)
 			values (?,
-			        ?,
 			        ?)
-		', [$this->UserId, $this->PollItemId, $this->Created]);
+		', [$this->UserId, $this->PollItemId]);
 	}
 
 	/**
diff --git a/lib/RssFeed.php b/lib/RssFeed.php
index 8960944c..039289d1 100644
--- a/lib/RssFeed.php
+++ b/lib/RssFeed.php
@@ -1,5 +1,9 @@
 <?
 use Safe\DateTimeImmutable;
+use Safe\Exceptions\DatetimeException;
+use Safe\Exceptions\FilesystemException;
+use Safe\Exceptions\ExecException;
+
 use function Safe\file_get_contents;
 use function Safe\filesize;
 use function Safe\preg_replace;
@@ -27,7 +31,9 @@ class RssFeed extends Feed{
 
 	protected function GetXmlString(): string{
 		if($this->XmlString === null){
-			$feed = Template::RssFeed(['url' => $this->Url, 'description' => $this->Description, 'title' => $this->Title, 'entries' => $this->Entries, 'updated' => (new DateTimeImmutable())->format('r')]);
+			/** @throws void */
+			$timestamp = (new DateTimeImmutable())->format('r');
+			$feed = Template::RssFeed(['url' => $this->Url, 'description' => $this->Description, 'title' => $this->Title, 'entries' => $this->Entries, 'updated' => $timestamp]);
 
 			$this->XmlString = $this->CleanXmlString($feed);
 		}
diff --git a/lib/Session.php b/lib/Session.php
index 81121ed6..981fb604 100644
--- a/lib/Session.php
+++ b/lib/Session.php
@@ -1,7 +1,10 @@
 <?
 use Exceptions\InvalidLoginException;
+use Exceptions\PasswordRequiredException;
 use Ramsey\Uuid\Uuid;
 use Safe\DateTimeImmutable;
+use Safe\Exceptions\DatetimeException;
+
 use function Safe\strtotime;
 
 /**
@@ -35,6 +38,10 @@ class Session{
 	// METHODS
 	// *******
 
+	/**
+	 * @throws Exceptions\InvalidLoginException
+	 * @throws Exceptions\PasswordRequiredException
+	 */
 	public function Create(?string $email = null, ?string $password = null): void{
 		try{
 			$this->User = User::GetIfRegistered($email, $password);
@@ -54,6 +61,8 @@ class Session{
 			else{
 				$uuid = Uuid::uuid4();
 				$this->SessionId = $uuid->toString();
+
+				/** @throws void */
 				$this->Created = new DateTimeImmutable();
 				Db::Query('
 						INSERT into Sessions (UserId, SessionId, Created)
diff --git a/lib/User.php b/lib/User.php
index e4401131..2c6f21b2 100644
--- a/lib/User.php
+++ b/lib/User.php
@@ -1,4 +1,6 @@
 <?
+
+use Exceptions\UserExistsException;
 use Ramsey\Uuid\Uuid;
 use Safe\DateTimeImmutable;
 
@@ -77,9 +79,14 @@ class User{
 	// METHODS
 	// *******
 
+	/**
+	 * @throws UserExistsException
+	 */
 	public function Create(?string $password = null): void{
 		$uuid = Uuid::uuid4();
 		$this->Uuid = $uuid->toString();
+
+		/** @throws void */
 		$this->Created = new DateTimeImmutable();
 
 		$this->PasswordHash = null;
@@ -145,6 +152,7 @@ class User{
 
 	/**
 	 * @throws Exceptions\UserNotFoundException
+	 * @throws Exceptions\PasswordRequiredException
 	 */
 	public static function GetIfRegistered(?string $identifier, ?string $password = null): User{
 		// We consider a user "registered" if they have a row in the Benefits table.
diff --git a/www/ebooks/index.php b/www/ebooks/index.php
index 5cda083b..d9fe63f2 100644
--- a/www/ebooks/index.php
+++ b/www/ebooks/index.php
@@ -2,6 +2,7 @@
 use function Safe\preg_replace;
 
 $page = HttpInput::Int(GET, 'page') ?? 1;
+$pages = 0;
 $perPage = HttpInput::Int(GET, 'per-page') ?? EBOOKS_PER_PAGE;
 $query = HttpInput::Str(GET, 'query') ?? '';
 $tags = HttpInput::GetArray('tags') ?? [];
@@ -9,6 +10,7 @@ $view = ViewType::tryFrom(HttpInput::Str(GET, 'view') ?? '');
 $sort = EbookSort::tryFrom(HttpInput::Str(GET, 'sort') ?? '');
 $queryString = '';
 $queryStringParams = [];
+$queryStringWithoutPage = '';
 
 try{
 	if($page <= 0){
@@ -96,6 +98,12 @@ catch(Exceptions\PageOutOfBoundsException){
 	header('Location: ' . $url);
 	exit();
 }
+catch(Exceptions\AppException $ex){
+	// Something very unexpected happened, log and emit 500
+	http_response_code(500); // Internal server error
+	Log::WriteErrorLogEntry($ex);
+	exit();
+}
 ?><?= Template::Header(['title' => $pageTitle, 'highlight' => 'ebooks', 'description' => $pageDescription, 'canonicalUrl' => $canonicalUrl]) ?>
 <main class="ebooks">
 	<h1><?= $pageHeader ?></h1>