Johann Karl Gottlieb THEUNERT
Schutzverwandter
Schutzverwandter - (2) (synonyms include Einwohner) resident of a town or especially of a city, who only enjoyed limited burgher rights. They were mainly those who owned no landed estate that they could bequeath to their heirs. They often owned a house on the property of a full burgher, and therefore in the villages they were often call Häusler, they often worked for their landlords or hired out as day laborers.
"Bürger - Modern meaning: citizen, person belonging to a particular nation or community. Historical definition: Member of a certain social class defined by its assets and bound by certain traditions. (These definitions were from Duden, and I'm sure the details varied depending on the place and time). In genealogy, I always translate this as "burgher" rather than "citizen" to distinguish it from "the modern concept of national citizenship.)
source: johnaddleman.bobaddleman.com/ immigrant.html
This is also possible (source: archiver.rootsweb.ancestry.com/ th/ read/ GEN-DE/ 1996-08/ 0839391418):
They were "protected" (="Schutz") but had their citizenship rights elsewhere, having moved to the town from some other place.

Full page showing 1838 death record Poland, Evangelical Church Books, 1700-2005 Evangelical W
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1838 Death record, first part shows he died 19 May 1838 Poland, Evangelical Church Books, 170
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1838 Death record - 2nd part, showing age of death as 45 years, 7 months, 20 days Poland, Evangel
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1838 Death part 3 - showing marriage, wife and children with their ages Johanne Christiane, 17 ye
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