fix: open sqlite inputs read-only - #64
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rusqlite default flags include SQLITE_OPEN_CREATE, so reading a mistyped path left a freshly created empty database behind (found when a failed ocel-studio connector run polluted its workspace). Inputs now open with SQLITE_OPEN_READ_ONLY; writes keep CREATE. Closes #63
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Closes #63
Reading a mistyped sqlite path created an empty database (rusqlite default flags include SQLITE_OPEN_CREATE) — found when a failed ocel-studio connector run left a 0-byte file that then broke the studio startup pick. Inputs now open with SQLITE_OPEN_READ_ONLY | NO_MUTEX; the write path keeps CREATE. Regression test asserts the missing-file read errors without creating anything.
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