Skip pdf conversion if a converted file exists

For images the conversion also returns the extracted text. If this
would have failed to be saved, it is extracted in the following
text-extraction step.

modules/store/src/main/scala/docspell/store/impl/Column.scala

@@ -44,6 +44,9 @@ case class Column(name: String, ns: String = "", alias: String = "") {
   def isNot[A: Put](value: A): Fragment =
     f ++ fr"<> $value"
 
+  def isNot(c: Column): Fragment =
+    f ++ fr"<>" ++ c.f
+
   def isNull: Fragment =
     f ++ fr"is null"
 

modules/store/src/main/scala/docspell/store/records/RAttachmentMeta.scala

@@ -46,6 +46,9 @@ object RAttachmentMeta {
   def exists(attachId: Ident): ConnectionIO[Boolean] =
     selectCount(id, table, id.is(attachId)).query[Int].unique.map(_ > 0)
 
+  def findById(attachId: Ident): ConnectionIO[Option[RAttachmentMeta]] =
+    selectSimple(all, table, id.is(attachId)).query[RAttachmentMeta].option
+
   def upsert(v: RAttachmentMeta): ConnectionIO[Int] =
     for {
       n0 <- update(v)

modules/store/src/main/scala/docspell/store/records/RAttachmentSource.scala

@@ -48,6 +48,21 @@ object RAttachmentSource {
       .unique
       .map(_ > 0)
 
+  def isConverted(attachId: Ident): ConnectionIO[Boolean] = {
+    val sId   = Columns.id.prefix("s")
+    val sFile = Columns.fileId.prefix("s")
+    val aId   = RAttachment.Columns.id.prefix("a")
+    val aFile = RAttachment.Columns.fileId.prefix("a")
+
+    val from = table ++ fr"s INNER JOIN" ++
+      RAttachment.table ++ fr"a ON" ++ aId.is(sId)
+
+    selectCount(aId, from, and(aId.is(attachId), aFile.isNot(sFile)))
+      .query[Int]
+      .unique
+      .map(_ > 0)
+  }
+
   def delete(attachId: Ident): ConnectionIO[Int] =
     deleteFrom(table, id.is(attachId)).update.run