Today, we announced a plan to limit the Stellar Development Foundation's Mainnet instances of Horizon to only provide one year of historical data, which will be truncated on a rolling basis. The planned truncation date is August 1st, 2024. This change will only impact you if you rely on horizon.stellar.org to retrieve network history >1 year old.
Check out the blog post for more info about the plan, for an explanation of the reasoning behind it, and for suggestions about alternatives for retrieving older network history: https://stellar.org/blog/foundation-news/sdf-s-horizon-limiting-data-to-1-year
Ultimately, this decision is intended to ensure the sustainability of SDF’s Horizon, and to contribute to the sustained health and decentralization of the Stellar network and its ecosystem.
Questions? Please raise them in the discussion thread on the #wallets channel of the Stellar Dev Discord.