Berlin's Duplicate Image Problem: The Key Decisions That Will Shape the City's Digital Archive

Berlin's Senate Chancellery is facing a deadline it can no longer quietly postpone. By September 2026, the city's central digital asset management system — used by departments ranging from the Senatsverwaltung für Stadtentwicklung to the BVG press office — must resolve a sprawling backlog of duplicate image files that has ballooned to an estimated 2.4 million redundant entries, according to a procurement document circulated to technology vendors in May. The problem is not merely administrative tidiness. Duplicate images stored across incompatible servers have already caused attribution errors in several publicly released planning documents for the Molkenmarkt redevelopment zone in Mitte.

The urgency comes from two directions at once. The city's Freedom of Information portal, launched under the Berlin Transparenzgesetz in 2021, has drawn a steady rise in public data requests — up roughly 34 percent between 2023 and 2025, based on figures the Senate published in its annual transparency report. At the same time, the state is mid-way through digitising decades of analogue planning records from the Landesarchiv Berlin on Eichborndamm in Reinickendorf, a project that risks injecting further duplicate content into an already strained system unless deduplication protocols are locked in first.

What the Procurement Fight Looks Like

Three vendors are understood to be competing for the framework contract, which carries a ceiling value of around €4.8 million spread across a 36-month term. The Berliner Beauftragte für Datenschutz und Informationsfreiheit, the city's data protection authority, has formally requested that any chosen solution store image metadata exclusively on servers within the European Economic Area, adding a compliance layer that has complicated at least one bidder's proposal. A decision from the procurement chamber is expected before the Bundestag summer recess ends in mid-August.

What makes the coming weeks particularly consequential is the knock-on effect for two high-profile city projects. The BVG, which manages more than 1,300 kilometres of combined rail and bus network across the capital, relies on the same shared asset library for its public communications and infrastructure documentation. A deduplication approach that strips metadata too aggressively could erase geolocation tags on images of specific U-Bahn maintenance sites — information that project managers at the Betriebshof Britz depot in Neukölln have flagged as operationally critical. Separately, the Stadtentwicklungsplan Wohnen 2040, the city's long-term housing blueprint, uses georeferenced photography to document vacant plots and existing building stock. Errors there ripple directly into the rent-cap and zoning debates that the SPD-led coalition is already navigating under significant political pressure.

The Decisions That Cannot Wait

City technology officials must resolve at least three discrete questions before any deduplication tool goes live. First, which department holds master authority when two agencies each claim an original version of the same image — a conflict that has already surfaced between the Senatsverwaltung für Kultur und Gesellschaftlichen Zusammenhalt and the Stadtmuseum Berlin on Poststraße in Mitte over historical photographs of Kreuzberg's SO36 neighbourhood. Second, how long deduplicated archives must be retained before deletion — a point where current Senate guidelines specify a minimum of ten years for planning-related imagery but are silent on press and communications material. Third, whether the city will adopt a centralised single-instance storage model or a distributed hash-verification approach, each of which carries sharply different cost and latency implications for smaller district offices such as those in Spandau and Treptow-Köpenick.

The September deadline is not legally binding in the strictest sense, but it is tied to the renewal of a data-centre hosting contract with the landeseigene IT-Dienstleistungszentrum Berlin, known as ITDZ Berlin, which provides cloud infrastructure to most Senate departments. Missing that window means carrying duplicate content into a new hosting environment — compounding the problem rather than resolving it. Officials at the ITDZ have indicated that a migration freeze will apply from October 1 through at least the end of November, making late summer the last practical window to act before the issue sits untouched until 2027.